Question

The power consumed by the $4\text{V}$ battery, in the given circuit shown below, is,

• A. $8\text{W}$
• B. $7\text{W}$
• C. $6\text{W}$
• D. $5\text{W}$

Answer 1

The correct option is A $8\text{W}$


For the given circuit, effective emf will be,

$E_0=10-4=6\text{V}$

And resistance of given circuit is

$R=3\Omega$

so, current in the circuit will be,

$I=\frac{E_0}{R}=\frac{6}{3}=2\text{A}$

So, power consumed by $4\text{V}$ battery is,

$P=VI=4\times 2=8\text{W}$

Hence, $\left(A\right)$ is the correct answer.