Chapter 25 Electric circuits Voltage and current Series
![Chapter 25 : Electric circuits • Voltage and current • Series and parallel circuits Chapter 25 : Electric circuits • Voltage and current • Series and parallel circuits](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-1.jpg)
![Electric circuits • Closed loop of electrical components around which current can flow, driven Electric circuits • Closed loop of electrical components around which current can flow, driven](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-2.jpg)
![Electric circuits Electric circuits](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-3.jpg)
![Electric circuits • Same principles apply in more complicated cases! Electric circuits • Same principles apply in more complicated cases!](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-4.jpg)
![Electric circuits • How do we deal with a more complicated case? What is Electric circuits • How do we deal with a more complicated case? What is](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-5.jpg)
![Electric circuits • When components are connected in series, the same electric current flows Electric circuits • When components are connected in series, the same electric current flows](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-6.jpg)
![Electric circuits • When components are connected in parallel, the same potential difference drops Electric circuits • When components are connected in parallel, the same potential difference drops](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-7.jpg)
![Electric circuits • When there is a junction in the circuit, the inward and Electric circuits • When there is a junction in the circuit, the inward and](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-8.jpg)
![Consider the currents I 1, I 2 and I 3 as indicated on the Consider the currents I 1, I 2 and I 3 as indicated on the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-9.jpg)
![Consider the currents I 1, I 2 and I 3 as indicated on the Consider the currents I 1, I 2 and I 3 as indicated on the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-10.jpg)
![A 9. 0 V battery is connected to a 3 W resistor. Which is A 9. 0 V battery is connected to a 3 W resistor. Which is](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-11.jpg)
![Resistors in circuits • Resistors are the basic components of a circuit that determine Resistors in circuits • Resistors are the basic components of a circuit that determine](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-12.jpg)
![Resistors in series/parallel • If two resistors are connected in series, what is the Resistors in series/parallel • If two resistors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-13.jpg)
![Resistors in series/parallel • If two resistors are connected in series, what is the Resistors in series/parallel • If two resistors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-14.jpg)
![Resistors in series/parallel • Total resistance increases in series! Resistors in series/parallel • Total resistance increases in series!](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-15.jpg)
![Resistors in series/parallel • If two resistors are connected in parallel, what is the Resistors in series/parallel • If two resistors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-16.jpg)
![Resistors in series/parallel • If two resistors are connected in parallel, what is the Resistors in series/parallel • If two resistors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-17.jpg)
![Resistors in series/parallel • If two resistors are connected in parallel, what is the Resistors in series/parallel • If two resistors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-18.jpg)
![Resistors in series/parallel • Total resistance decreases in parallel! Resistors in series/parallel • Total resistance decreases in parallel!](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-19.jpg)
![Resistors in series/parallel • What’s the current flowing? (1) Combine these 2 resistors in Resistors in series/parallel • What’s the current flowing? (1) Combine these 2 resistors in](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-20.jpg)
![If an additional resistor, R 2, is added in series to the circuit, what If an additional resistor, R 2, is added in series to the circuit, what](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-21.jpg)
![If an additional resistor, R 3, is added in parallel to the circuit, what If an additional resistor, R 3, is added in parallel to the circuit, what](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-22.jpg)
![Series vs. Parallel CURRENT Same current through all series elements VOLTAGE Voltages add to Series vs. Parallel CURRENT Same current through all series elements VOLTAGE Voltages add to](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-23.jpg)
![Voltage divider Consider a circuit with several resistors in series with a battery. Current Voltage divider Consider a circuit with several resistors in series with a battery. Current](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-24.jpg)
![What must be the resistance R 1 so that V 1 = 2. 0 What must be the resistance R 1 so that V 1 = 2. 0](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-25.jpg)
![Capacitors • A capacitor is a device in a circuit which can be used Capacitors • A capacitor is a device in a circuit which can be used](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-26.jpg)
![Capacitors • A capacitor is a device in a circuit which can be used Capacitors • A capacitor is a device in a circuit which can be used](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-27.jpg)
![Capacitors • The capacitance C measures the amount of charge Q which can be Capacitors • The capacitance C measures the amount of charge Q which can be](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-28.jpg)
![Resistor-capacitor circuit • Consider the following circuit with a resistor and a capacitor in Resistor-capacitor circuit • Consider the following circuit with a resistor and a capacitor in](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-29.jpg)
![Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-30.jpg)
![Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-31.jpg)
![Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-32.jpg)
![Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-33.jpg)
![Capacitors in series/parallel • If two capacitors are connected in series, what is the Capacitors in series/parallel • If two capacitors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-34.jpg)
![Capacitors in series/parallel • If two capacitors are connected in series, what is the Capacitors in series/parallel • If two capacitors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-35.jpg)
![Capacitors in series/parallel • If two capacitors are connected in parallel, what is the Capacitors in series/parallel • If two capacitors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-36.jpg)
![Capacitors in series/parallel • If two capacitors are connected in parallel, what is the Capacitors in series/parallel • If two capacitors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-37.jpg)
![Two 5. 0 F capacitors are in series with each other and a 1. Two 5. 0 F capacitors are in series with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-38.jpg)
![Two 5. 0 F capacitors are in series with each other and a 1. Two 5. 0 F capacitors are in series with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-39.jpg)
![Two 5. 0 F capacitors are in parallel with each other and a 1. Two 5. 0 F capacitors are in parallel with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-40.jpg)
![Two 5. 0 F capacitors are in parallel with each other and a 1. Two 5. 0 F capacitors are in parallel with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-41.jpg)
![Resistors vs. Capacitors Resistors vs. Capacitors](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-42.jpg)
![Resistors vs. Capacitors Resistors vs. Capacitors](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-43.jpg)
![Kirchoff’s rules • Sometimes we might need to analyse more complicated circuits, for example Kirchoff’s rules • Sometimes we might need to analyse more complicated circuits, for example](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-44.jpg)
![Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-45.jpg)
![Kirchoff’s rules • The sum of currents at any junction is zero • Watch Kirchoff’s rules • The sum of currents at any junction is zero • Watch](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-46.jpg)
![Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-47.jpg)
![Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-48.jpg)
![Kirchoff’s rules • Sum of voltage changes around a closed loop is zero • Kirchoff’s rules • Sum of voltage changes around a closed loop is zero •](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-49.jpg)
![Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-50.jpg)
![Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-51.jpg)
![Kirchoff’s rules • What are the currents flowing in the 3 resistors? We now Kirchoff’s rules • What are the currents flowing in the 3 resistors? We now](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-52.jpg)
![Consider the loop shown in the circuit. The correct Kirchoff loop equation, starting at Consider the loop shown in the circuit. The correct Kirchoff loop equation, starting at](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-53.jpg)
![Chapter 25 summary • Components in a series circuit all carry the same current Chapter 25 summary • Components in a series circuit all carry the same current](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-54.jpg)
- Slides: 54
![Chapter 25 Electric circuits Voltage and current Series and parallel circuits Chapter 25 : Electric circuits • Voltage and current • Series and parallel circuits](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-1.jpg)
Chapter 25 : Electric circuits • Voltage and current • Series and parallel circuits • Resistors and capacitors • Kirchoff’s rules for analysing circuits
![Electric circuits Closed loop of electrical components around which current can flow driven Electric circuits • Closed loop of electrical components around which current can flow, driven](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-2.jpg)
Electric circuits • Closed loop of electrical components around which current can flow, driven by a potential difference • Current (in Amperes A) is the rate of flow of charge • Potential difference (in volts V) is the work done on charge
![Electric circuits Electric circuits](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-3.jpg)
Electric circuits
![Electric circuits Same principles apply in more complicated cases Electric circuits • Same principles apply in more complicated cases!](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-4.jpg)
Electric circuits • Same principles apply in more complicated cases!
![Electric circuits How do we deal with a more complicated case What is Electric circuits • How do we deal with a more complicated case? What is](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-5.jpg)
Electric circuits • How do we deal with a more complicated case? What is the current flowing from the battery?
![Electric circuits When components are connected in series the same electric current flows Electric circuits • When components are connected in series, the same electric current flows](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-6.jpg)
Electric circuits • When components are connected in series, the same electric current flows through them • Charge conservation : current cannot disappear!
![Electric circuits When components are connected in parallel the same potential difference drops Electric circuits • When components are connected in parallel, the same potential difference drops](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-7.jpg)
Electric circuits • When components are connected in parallel, the same potential difference drops across them • Points connected by a wire at the same voltage!
![Electric circuits When there is a junction in the circuit the inward and Electric circuits • When there is a junction in the circuit, the inward and](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-8.jpg)
Electric circuits • When there is a junction in the circuit, the inward and outward currents to the junction are the same • Charge conservation : current cannot disappear!
![Consider the currents I 1 I 2 and I 3 as indicated on the Consider the currents I 1, I 2 and I 3 as indicated on the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-9.jpg)
Consider the currents I 1, I 2 and I 3 as indicated on the circuit diagram. If I 1 = 2. 5 A and I 2 = 4 A, what is the value of I 3? 1. 2. 3. 4. 5. 6. 5 A 1. 5 A − 1. 5 A 0 A The situation is not possible I 2 I 1 I 3
![Consider the currents I 1 I 2 and I 3 as indicated on the Consider the currents I 1, I 2 and I 3 as indicated on the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-10.jpg)
Consider the currents I 1, I 2 and I 3 as indicated on the circuit diagram. If I 1 = 2. 5 A and I 2 = 4 A, what is the value of I 3? I 2 I 1 current in = current out (Negative sign means opposite direction to arrow. ) I 3
![A 9 0 V battery is connected to a 3 W resistor Which is A 9. 0 V battery is connected to a 3 W resistor. Which is](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-11.jpg)
A 9. 0 V battery is connected to a 3 W resistor. Which is the incorrect statement about potential differences (voltages)? 1. 2. 3. 4. Vb – Va = 9. 0 V Vb – Vc = 0 V Vc – Vd = 9. 0 V Vd – Va = 9. 0 V a b d c
![Resistors in circuits Resistors are the basic components of a circuit that determine Resistors in circuits • Resistors are the basic components of a circuit that determine](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-12.jpg)
Resistors in circuits • Resistors are the basic components of a circuit that determine current flow : Ohm’s law I = V/R
![Resistors in seriesparallel If two resistors are connected in series what is the Resistors in series/parallel • If two resistors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-13.jpg)
Resistors in series/parallel • If two resistors are connected in series, what is the total resistance? same current
![Resistors in seriesparallel If two resistors are connected in series what is the Resistors in series/parallel • If two resistors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-14.jpg)
Resistors in series/parallel • If two resistors are connected in series, what is the total resistance? • Total resistance increases in series!
![Resistors in seriesparallel Total resistance increases in series Resistors in series/parallel • Total resistance increases in series!](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-15.jpg)
Resistors in series/parallel • Total resistance increases in series!
![Resistors in seriesparallel If two resistors are connected in parallel what is the Resistors in series/parallel • If two resistors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-16.jpg)
Resistors in series/parallel • If two resistors are connected in parallel, what is the total resistance?
![Resistors in seriesparallel If two resistors are connected in parallel what is the Resistors in series/parallel • If two resistors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-17.jpg)
Resistors in series/parallel • If two resistors are connected in parallel, what is the total resistance?
![Resistors in seriesparallel If two resistors are connected in parallel what is the Resistors in series/parallel • If two resistors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-18.jpg)
Resistors in series/parallel • If two resistors are connected in parallel, what is the total resistance? • Total resistance decreases in parallel!
![Resistors in seriesparallel Total resistance decreases in parallel Resistors in series/parallel • Total resistance decreases in parallel!](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-19.jpg)
Resistors in series/parallel • Total resistance decreases in parallel!
![Resistors in seriesparallel Whats the current flowing 1 Combine these 2 resistors in Resistors in series/parallel • What’s the current flowing? (1) Combine these 2 resistors in](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-20.jpg)
Resistors in series/parallel • What’s the current flowing? (1) Combine these 2 resistors in parallel: (2) Combine all the resistors in series:
![If an additional resistor R 2 is added in series to the circuit what If an additional resistor, R 2, is added in series to the circuit, what](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-21.jpg)
If an additional resistor, R 2, is added in series to the circuit, what happens to the power dissipated by R 1? R 1 1. Increases 2. Decreases 3. Stays the same
![If an additional resistor R 3 is added in parallel to the circuit what If an additional resistor, R 3, is added in parallel to the circuit, what](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-22.jpg)
If an additional resistor, R 3, is added in parallel to the circuit, what happens to the total current, I? 1. 2. 3. 4. I V Increases Decreases Stays the same Depends on R values Parallel resistors: reciprocal effective resistance is sum of reciprocal resistances
![Series vs Parallel CURRENT Same current through all series elements VOLTAGE Voltages add to Series vs. Parallel CURRENT Same current through all series elements VOLTAGE Voltages add to](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-23.jpg)
Series vs. Parallel CURRENT Same current through all series elements VOLTAGE Voltages add to total circuit voltage RESISTANCE Adding resistance increases total R Current “splits up” through parallel branches Same voltage across all parallel branches Adding resistance reduces total R String of Christmas lights – connected in series Power outlets in house – connected in parallel
![Voltage divider Consider a circuit with several resistors in series with a battery Current Voltage divider Consider a circuit with several resistors in series with a battery. Current](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-24.jpg)
Voltage divider Consider a circuit with several resistors in series with a battery. Current in circuit: The potential difference across one of the resistors (e. g. R 1) The fraction of the total voltage that appears across a resistor in series is the ratio of the given resistance to the total resistance.
![What must be the resistance R 1 so that V 1 2 0 What must be the resistance R 1 so that V 1 = 2. 0](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-25.jpg)
What must be the resistance R 1 so that V 1 = 2. 0 V? 1. 0. 80 W 2. 1. 2 W 3. 6. 0 W 4. 30 W R 1 12 V 6. 0 W
![Capacitors A capacitor is a device in a circuit which can be used Capacitors • A capacitor is a device in a circuit which can be used](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-26.jpg)
Capacitors • A capacitor is a device in a circuit which can be used to store charge A capacitor consists of two charged plates … Electric field E It’s charged by connecting it to a battery …
![Capacitors A capacitor is a device in a circuit which can be used Capacitors • A capacitor is a device in a circuit which can be used](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-27.jpg)
Capacitors • A capacitor is a device in a circuit which can be used to store charge Example : store and release energy …
![Capacitors The capacitance C measures the amount of charge Q which can be Capacitors • The capacitance C measures the amount of charge Q which can be](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-28.jpg)
Capacitors • The capacitance C measures the amount of charge Q which can be stored for given potential difference V +Q -Q (Value of C depends on geometry…) V • Unit of capacitance is Farads [F]
![Resistorcapacitor circuit Consider the following circuit with a resistor and a capacitor in Resistor-capacitor circuit • Consider the following circuit with a resistor and a capacitor in](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-29.jpg)
Resistor-capacitor circuit • Consider the following circuit with a resistor and a capacitor in series V What happens when we connect the circuit?
![Resistorcapacitor circuit When the switch is connected the battery charges up the capacitor Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-30.jpg)
Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor • Move the switch to point a • Initial current flow I=V/R V • Charge Q flows from battery onto the capacitor • Potential across the capacitor VC=Q/C increases • Potential across the resistor VR decreases • Current decreases to zero
![Resistorcapacitor circuit When the switch is connected the battery charges up the capacitor Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-31.jpg)
Resistor-capacitor circuit • When the switch is connected, the battery charges up the capacitor V
![Resistorcapacitor circuit When the battery is disconnected the capacitor pushes charge around the Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-32.jpg)
Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the circuit • Move the switch to point b • Initial current flow I=VC/R V • Charge flows from one plate of capacitor to other • Potential across the capacitor VC=Q/C decreases • Current decreases to zero
![Resistorcapacitor circuit When the battery is disconnected the capacitor pushes charge around the Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-33.jpg)
Resistor-capacitor circuit • When the battery is disconnected, the capacitor pushes charge around the circuit V
![Capacitors in seriesparallel If two capacitors are connected in series what is the Capacitors in series/parallel • If two capacitors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-34.jpg)
Capacitors in series/parallel • If two capacitors are connected in series, what is the total capacitance? Same charge must be on every plate!
![Capacitors in seriesparallel If two capacitors are connected in series what is the Capacitors in series/parallel • If two capacitors are connected in series, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-35.jpg)
Capacitors in series/parallel • If two capacitors are connected in series, what is the total capacitance? • Total capacitance decreases in series!
![Capacitors in seriesparallel If two capacitors are connected in parallel what is the Capacitors in series/parallel • If two capacitors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-36.jpg)
Capacitors in series/parallel • If two capacitors are connected in parallel, what is the total capacitance?
![Capacitors in seriesparallel If two capacitors are connected in parallel what is the Capacitors in series/parallel • If two capacitors are connected in parallel, what is the](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-37.jpg)
Capacitors in series/parallel • If two capacitors are connected in parallel, what is the total capacitance? • Total capacitance increases in parallel!
![Two 5 0 F capacitors are in series with each other and a 1 Two 5. 0 F capacitors are in series with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-38.jpg)
Two 5. 0 F capacitors are in series with each other and a 1. 0 V battery. Calculate the charge on each capacitor (Q) and the total charge drawn from the battery (Qtotal). 1. 2. 3. 4. Q = 5. 0 C, Qtotal = 5. 0 C Q = 0. 25 C, Qtotal = 0. 50 C Q = 2. 5 C, Qtotal = 2. 5 C Q = 2. 5 C, Qtotal = 5. 0 C 5 F 1 V 5 F
![Two 5 0 F capacitors are in series with each other and a 1 Two 5. 0 F capacitors are in series with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-39.jpg)
Two 5. 0 F capacitors are in series with each other and a 1. 0 V battery. Calculate the charge on each capacitor (Q) and the total charge drawn from the battery (Qtotal). 5 F 1 V Potential difference across each capacitor = 0. 5 V 5 F
![Two 5 0 F capacitors are in parallel with each other and a 1 Two 5. 0 F capacitors are in parallel with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-40.jpg)
Two 5. 0 F capacitors are in parallel with each other and a 1. 0 V battery. Calculate the charge on each capacitor (Q) and the total charge drawn from the battery (Qtotal). 1. 2. 3. 4. Q = 5. 0 C, Qtotal = 5. 0 C Q = 0. 2 C, Qtotal = 0. 4 C Q = 5. 0 C, Qtotal = 10 C Q = 2. 5 C, Qtotal = 2. 5 C 1 V 5 F
![Two 5 0 F capacitors are in parallel with each other and a 1 Two 5. 0 F capacitors are in parallel with each other and a 1.](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-41.jpg)
Two 5. 0 F capacitors are in parallel with each other and a 1. 0 V battery. Calculate the charge on each capacitor (Q) and the total charge drawn from the battery (Qtotal). 1 V Potential difference across each capacitor = 1 V 5 F
![Resistors vs Capacitors Resistors vs. Capacitors](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-42.jpg)
Resistors vs. Capacitors
![Resistors vs Capacitors Resistors vs. Capacitors](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-43.jpg)
Resistors vs. Capacitors
![Kirchoffs rules Sometimes we might need to analyse more complicated circuits for example Kirchoff’s rules • Sometimes we might need to analyse more complicated circuits, for example](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-44.jpg)
Kirchoff’s rules • Sometimes we might need to analyse more complicated circuits, for example … Q) What are the currents flowing in the 3 resistors? • Kirchoff’s rules give us a systematic method
![Kirchoffs rules What are the currents flowing in the 3 resistors Kirchoffs junction Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-45.jpg)
Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction rule : the sum of currents at any junction is zero
![Kirchoffs rules The sum of currents at any junction is zero Watch Kirchoff’s rules • The sum of currents at any junction is zero • Watch](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-46.jpg)
Kirchoff’s rules • The sum of currents at any junction is zero • Watch out for directions : into a junction is positive, out of a junction is negative
![Kirchoffs rules What are the currents flowing in the 3 resistors Kirchoffs junction Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-47.jpg)
Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s junction rule : the sum of currents at any junction is zero
![Kirchoffs rules What are the currents flowing in the 3 resistors Kirchoffs loop Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-48.jpg)
Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop rule : the sum of voltage changes around a closed loop is zero
![Kirchoffs rules Sum of voltage changes around a closed loop is zero Kirchoff’s rules • Sum of voltage changes around a closed loop is zero •](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-49.jpg)
Kirchoff’s rules • Sum of voltage changes around a closed loop is zero • Consider a unit charge (Q=1 Coulomb) going around this loop • It gains energy from the battery (voltage change +V) • It loses energy in the resistor (voltage change - I R) • Conservation of energy : V - I R = 0 (or as we know, V = I R)
![Kirchoffs rules What are the currents flowing in the 3 resistors Kirchoffs loop Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-50.jpg)
Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop rule : the sum of voltage changes around a closed loop is zero
![Kirchoffs rules What are the currents flowing in the 3 resistors Kirchoffs loop Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-51.jpg)
Kirchoff’s rules • What are the currents flowing in the 3 resistors? Kirchoff’s loop rule : the sum of voltage changes around a closed loop is zero
![Kirchoffs rules What are the currents flowing in the 3 resistors We now Kirchoff’s rules • What are the currents flowing in the 3 resistors? We now](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-52.jpg)
Kirchoff’s rules • What are the currents flowing in the 3 resistors? We now have 3 equations:
![Consider the loop shown in the circuit The correct Kirchoff loop equation starting at Consider the loop shown in the circuit. The correct Kirchoff loop equation, starting at](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-53.jpg)
Consider the loop shown in the circuit. The correct Kirchoff loop equation, starting at “a” is •
![Chapter 25 summary Components in a series circuit all carry the same current Chapter 25 summary • Components in a series circuit all carry the same current](https://slidetodoc.com/presentation_image_h/fb504b5b8d58f8d6a248edf1d85f73b5/image-54.jpg)
Chapter 25 summary • Components in a series circuit all carry the same current • Components in a parallel circuit all experience the same potential difference • Capacitors are parallel plates which store equal & opposite charge Q = C V • Kirchoff’s junction rule and loop rule provide a systematic method for analysing circuits
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