First slide

KVL

Question

In the circuit shown a current through 20 $Ω$ resistor equals

Moderate

A

3/2 A
B

2/3 A
C

5/2 A
D

9/2 A

Solution

Let x be the current through 20 $Ω$ resistor and y be the current through 10 $Ω$ resistor.
Applying KVL, $10 - 10 y = 0 \Rightarrow y = 1 A$
Also, $20 - 20 x + 10 y = 0 \Rightarrow 20 - 20 x + 10 \times 1 = 0 \Rightarrow x = 3 / 2 A$

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