Question

Heat energy is being produced in a resistance in a circuit at the rate of $100W$. The current of $3A$ is flowing in the circuit. What must be the value of the resistance?

Answer 1

Given that,

Power, $P=100W$

Current, $I=3A$

Power,

$P=VI$

$P=I^{2}R$

$R=\frac{P}{I^2}$

So,

$R=\frac{100}{9}$

$R=11.1\Omega$