A circuit is set up as shown in the diagram below. When the key is closed, the ammeter reading will be?

A. 6A
B. 4A
C. 2A
D. 1A

Correct Answer: Option C

Explanation

The resistors are connected both in parallel and series. To calculate the total resistance, we have:

For the parallel connection: 1/R=1/1+1/1

1/R=2⟹R=0.5Ω

For the series connection: Rtotal=(1+0.5)Ω=1.5Ω
Recall, V=IR
3=1.5I⟹I=3/1.5=2A