1 Electric Circuits I EELE 2310 Dr Assad

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1 Electric Circuits I (EELE 2310) Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I

1 Electric Circuits I (EELE 2310) Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

2 Assad Abu-Jasser, Ph. D Electric Power Engineering site. iugaza. edu. ps/ajasser@iugaza. edu. ps

2 Assad Abu-Jasser, Ph. D Electric Power Engineering site. iugaza. edu. ps/ajasser@iugaza. edu. ps Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

3 Chapter Two Circuit Elements Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE

3 Chapter Two Circuit Elements Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

4 Electric Sources Voltage and Current Sources Electrical Source is a device that is

4 Electric Sources Voltage and Current Sources Electrical Source is a device that is capable of converting nonelectric energy to electric energy and vice versa An Ideal Voltage Source is a circuit element that maintains a prescribed voltage across its terminals regardless of the current flowing in those terminals An Ideal Current Source is a circuit element that maintains a prescribed current through its terminals regardless of the voltage across those terminals Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

5 Voltage and Current Sources Independent Sources An Independent Source establishes a voltage or

5 Voltage and Current Sources Independent Sources An Independent Source establishes a voltage or current in a circuit without relying on voltages or currents elsewhere in the circuit Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

6 Voltage and Current Sources Dependent Sources A dependent Source (Controlled Source) establishes a

6 Voltage and Current Sources Dependent Sources A dependent Source (Controlled Source) establishes a voltage or current whose value depends on the value of a voltage or a current elsewhere in the circuit μ, ρ, α, and β are multiplying constants Active Elements capable of generating electric energy Passive Elements cannot generate electric energy Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

7 Example 2. 1 Using the definition of the ideal independent voltage and current

7 Example 2. 1 Using the definition of the ideal independent voltage and current sources, state which interconnections in the following figures are permissible and which violate the constraints imposed by the ideal sources Valid Invalid Valid Dr. Assad Abu-Jasser, EE Department-IUGAZA Invalid Electric Circuits I (EELE 2310)

8 Example 2. 2 Using the definition of the ideal independent and dependent sources,

8 Example 2. 2 Using the definition of the ideal independent and dependent sources, state which interconnections in the following figures are valid and which violate the constraints imposed by the ideal sources Invalid Valid Invalid Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

9 Electrical Resistance Ohm’s Law Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE

9 Electrical Resistance Ohm’s Law Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

10 Example 2. 3 In each of the following circuits υ or i is

10 Example 2. 3 In each of the following circuits υ or i is not known. (a) Calculate the value of υ or i, (b) Determine the power dissipated in each resistor. 8 V -20 V 10 A -2 A Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

11 Example 2. 4 Constructing A Circuit Model Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric

11 Example 2. 4 Constructing A Circuit Model Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

12 Example 2. 5 The voltage and the current are measured at the terminals

12 Example 2. 5 The voltage and the current are measured at the terminals of the device in the figure shown and the values are tabulated as given. Construct a circuit model of the device inside the box. Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

13 Kirchhoff’s Laws Kirchhoff’s Current Law 7 Unknowns The algebraic sum of all currents

13 Kirchhoff’s Laws Kirchhoff’s Current Law 7 Unknowns The algebraic sum of all currents at any node in a circuit equals zero Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

14 Kirchhoff’s Laws Kirchhoff’s Voltage Law The algebraic sum of all voltages around any

14 Kirchhoff’s Laws Kirchhoff’s Voltage Law The algebraic sum of all voltages around any closed path in a circuit equals zero Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

15 Example 2. 6 Sum the currents at each node in the circuit shown.

15 Example 2. 6 Sum the currents at each node in the circuit shown. Note that there is no connection dot (●) in the center of the diagram. Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

16 Example 2. 7 Sum the voltages around each designated path in the circuit

16 Example 2. 7 Sum the voltages around each designated path in the circuit shown. Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

17 Example 2. 8 Use Kirchhoff’s laws and Ohm’s law to find io in

17 Example 2. 8 Use Kirchhoff’s laws and Ohm’s law to find io in the circuit shown and test the solution for io by verifying that the total power generated equals the total power dissipated. Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

18 Example 2. 9 The terminal voltage and the terminal current were measured on

18 Example 2. 9 The terminal voltage and the terminal current were measured on the device shown in the figure shown and the values are tabulated. (a) construct a circuit model of the device inside the box, (b) using the circuit model, predict the power this device will deliver to a 10 Ω resistor. Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

19 Analysis of Circuits Containing Dependent Sources Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits

19 Analysis of Circuits Containing Dependent Sources Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

20 Example 2. 10 Use Kirchhoff’s laws and Ohm’s law to find the voltage

20 Example 2. 10 Use Kirchhoff’s laws and Ohm’s law to find the voltage υo in the circuit shown and test the solution by verifying that the total power developed equals the total power dissipated. Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

21 Practical Perspective Electrical Safety Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE

21 Practical Perspective Electrical Safety Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)

22 End of Chapter Two Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE

22 End of Chapter Two Dr. Assad Abu-Jasser, EE Department-IUGAZA Electric Circuits I (EELE 2310)