Question

A battery is supplying power to a tape-recorder by cable of resistance of $0.02\Omega$. If the battery is generating $50W$ power at $5V$, then power received by tape-recorder is:- (neglect internal resistance of battery)

• A. $50W$
• B. $45W$
• C. $30W$
• D. $48W$

Answer 1

The correct option is D $48W$

$P=VI$

$\Rightarrow I=10A$

power loss in the cable $=I^{2}R=100\times 0.02=2W$

Hence, power supplied to the tape$-$ recorder is $48W$

Hence,

option $\left(D\right)$ is correct answer.