Question

Find out the total power supplied by the 60-V source in the circuit shown in figure.

• A. 360 W
• B. 200 W
• C. 400 W
• D. 180 W

Answer 1

The correct option is A 360 W

First we will find the equivalent resistance of the circuit.

The $7\Omega$ and $5\Omega$ are in series so equivalent is $7+5=12\Omega$.

$12\Omega$ and $6\Omega$ are in parallel, so equivalent is $12\times 6/(12+6)=4\Omega$.

These $4\Omega$ and $12\Omega$ are in parallel, so their equivalent is $12\times 4/(12+4)=3\Omega$.

This $3\Omega$ and $7\Omega$ are in series so equivalent is $3+7=10\Omega$.

So the equivalent resistance of the circuit is $R_{eq}=10\Omega$.

Thus the power supplied is $\frac{V^2}{R_{eq}}={60}^2/10=360W$