Electricity Electric Circuits 13 1 Electric Circuits 13

Electricity Electric Circuits • 13. 1 Electric Circuits • 13. 2 Current and Voltage • 13. 3 Resistance and Ohm's Law

13 A Investigation: Electricity Key Questions: What is electricity? How is electricity measured and described? What is a circuit?

13 A Investigation Topics • • • Identify conductors and insulators. Measure voltage in a battery. Measure current in a circuit. Draw circuit diagrams. Investigate how a dimmer switch works.

Chapter 13. 1 Objectives and Vocabulary • Explain how electrical energy is supplied to devices in a circuit. • Use electrical symbols to draw simple circuit diagrams. • Distinguish between open and closed circuits. • • electric current electric circuit diagram electrical symbols resistor closed circuit open circuit switch

Chapter 13. 2 Objectives and Vocabulary • List the units used to measure current and voltage. • Describe how to measure current and voltage in a circuit. • Explain the function of a battery in a circuit. • • ampere voltage voltmeter multimeter battery ammeter

13 B Investigation: Resistance and Ohm's Law Key Questions: What is the relationship between current, voltage and resistance? How does a potentiometer work? What is voltage drop and what does it tell you about where the electrical energy carried by the current is going?

13 B Investigation Topics • Measure resistance in a circuit. • Use Ohm's law to identify the mystery resistor in a circuit. • Investigate how a potentiometer works. • Investigate the relationship between voltage drop across the potentiometer and voltage drop across the bulb in a circuit.

Chapter 13. 3 Objectives and Vocabulary • Explain the relationships between current, voltage and resistance. • Use Ohm's law to calculate current, resistance, or voltage. • Distinguish between conductors and insulators. • • resistance ohm Ohm's law conductor insulator semiconductor potentiometer

Do We Understand Simple Series Circuits? Problem #1 A circuit is made of a 48 v battery and three resistors connected in series. R 1 has a resistance of 2 Ω, R 2 has a resistance of 4 Ω, and R 3 has a resistance of 6 Ω. A) Draw the circuit diagram. B) Find the total resistance. C) Find the circuit current. D) Find V 1, V 2, and V 3.

• Problem #2 • A circuit is made of a 60 volt battery and three resistors connected in series. R 1 has a resistance of 5 Ω, R 2 has a resistance of 10 Ω, and R 3 has a resistance of 15 Ω. • A) Draw the circuit diagram. • B) Find the total resistance. • C) Find the circuit current. • D) Find V 1, V 2, and V 3.