The document discusses resistors in series and parallel circuits. It covers basic concepts like voltage and current division rules as applied to series and parallel resistor circuits. Example circuit problems are presented to demonstrate calculating voltages, currents, power dissipation, and power delivered by a voltage source for circuits containing series and/or parallel resistances. Students are assigned practice problems to solve involving series and parallel resistors from the course textbook.
9. KCL , current division rule
(current,“node”)
9
What did we learn??
10. 10
What did we learn??
KVL, voltage division rule(Voltage, “path”)
11. 11
Example-1
Ex: Find V1, V2, and V3, for Vs = 12 V,
R1= 1 K, R2 = 2 K , and R3 = 1 K .
1 2 3
1 2 3
0
12
3
1 2 1
s
s
V V V V
IR IR IR V
I A
1 1
2 2
3 3
3*1 3
3*2 6
3*1 3
V IR v
V IR v
V IR v
12. 12
EX: Find I1, I2, and I3, for Is = 12 A,G1=1 K,
G2 = 2 K , and G3 = 1 K .
Example-2
17. For the following circuit:
a. Find the values of currents ia , ib and the voltage vo.
b. The power dissipated in each resistor.
c. The power delivered by the voltage source.
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Example-5
18. 18
20,80
2
50
80 || 20 16
16 4 20
50 / 20 2.5
division law
1/ 20
i 2.5( ) 2
1/ 20 1/ 80
2.5 2 0.5
(4) 20 (0.25) 80 (6.25) 4 125
50 2.5 125
T
T
a
b
R
V
R
R
I A
Current
A
i A
P I XR x x x
P X W
Example-5
Answer
19. What can you solve at home?
Chapter 1 problems:
24,25,26,27,28,56,57,58
Chapter 2 problems:
1,2,3,4,5,39,40,41,42,43
Chapter 3 problems:1-
10,20,21,22,23,24,25,27,29-33,41,44,47-
67,75,77,78,80,81,82,85,88,90
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