1. Kirchhoff’s Current and Voltage Laws

2. KCL (Kirchhoff’s Current Law) The sum of the currents entering a node equals the sum of the currents exiting a node.

3. Node

4. Application of KCL I 1 = 2A I 2 = 3A I 3 = 5A

5. I 1 = ? I 2 = 150 mA I 3 = 250 mA Problem w/KCL

6. KVL (Kirchhoff’s Voltage Law) The sum of the potential differences around a closed loop equals zero.

7. Closed Loop #1

8. Closed Loop #2

9. Closed Loop #3

10. Closed Loop #4

11. Not Closed #1

12. Not Closed #2

13. What KVL Really Means Sum of the Voltage drops across resistors equals the Supply Voltage in a Loop.

14. KVL #1

15. KVL #2