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Physics · 2025 · 1 mark
CBSE 2025 · Region 1 · Set 2 · Q6
A voltage ν=ν_0 sin ω t applied to a circuit drives a current i = i_0 sin (ω t +φ) in the circuit. The average power consumed in the circuit over a…
A voltage $\displaystyle \nu=\nu_{0} \sin \omega \mathrm{t}$ applied to a circuit drives a current $\displaystyle \mathrm{i}=\mathrm{i}_{0} \sin (\omega \mathrm{t}+\phi)$ in the circuit. The average power consumed in the circuit over a cycle is
Official answer
(D)
$\displaystyle \frac{\mathrm{i}_{0} \mathrm{v}_{0}}{2} \cos \phi$
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.