1. Kirchhoff’s Rules

4. I = 0 ( at any junction )

5. I is + when it enters a junction.

6. I is - when it enters a junction.

7. I = 0

8. I1 + I2 - I3= 0

9. I1 + I2 = I3I3

11. A loop is any closed conducting path.

12. V = 0 ( at any loop)

14. Examples: 2. In the circuit shown, find: (a) the current in resistor R; (b) the resistance R; (c) the unknown voltage V and (d) if the circuit is broken at point x, what is the current in resistor R? (Ans. (a)2.00 A, (b) 5.00 , (c) 42.0 V, (d) 3.5 A ) V=? a b

15. Examples: 3. Find the voltages V1 and V2 in the circuit below and find the potential difference of point b relative to a. (Ans. V1=18.0 V, V2=7.00 V, Vba=-13.0V.) V1=? V2=?

16. ---FIN--- 