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 is

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

Answer 1

Answer: (B)

550W

Answer 2

: Here, $V = 220V$

Resistance, $R = 22\Omega$

Impedance, $Z = 44\Omega$

Current in circuit, $I = \frac{V}{Z} = \frac{220}{44\Omega} = 5A$

Power dissipated in the circuit,

$P = I^{2}R = (5)^{2} \times 22 = 550W$