Question

An alternating supply of 220 V is applied across a circuit with resistance 22 $\Omega$ and impedance 44 $\Omega$. The power dissipated in the circuit will be

• A. 1100 W
• B. 550 W
• C. 2200 W
• D. (2200/3) W

Answer 1

The correct option is B 550 W

Here, V = 220 V
Resistance, R = 22 $\Omega$
Impedance, Z = 44 $\Omega$
Current in circuit, $I=\frac{V}{Z}=\frac{220V}{44\Omega }=5A$
Power dissipated in the circuit,
$P=I^{2}R=(5{)}^2\times 22=550W$