<Dd> P t i m e a v e r a g e d = V r m s 2 R . (\ displaystyle P_ (\ rm (time ~ averaged)) = (\ frac ((V_ (\ rm (rms))) ^ (2)) (R)).) </Dd> <Dl> <Dt> Power oscillation </Dt> <Dd> v (t) = V p e a k sin ⁡ (ω t) (\ displaystyle v (t) = V_ (\ mathrm (peak)) \ sin (\ omega t)) </Dd> <Dd> i (t) = v (t) R = V p e a k R sin ⁡ (ω t) (\ displaystyle i (t) = (\ frac (v (t)) (R)) = (\ frac (V_ (\ mathrm (peak))) (R)) \ sin (\ omega t)) </Dd> <Dd> P (t) = v (t) i (t) = (V p e a k) 2 R sin 2 ⁡ (ω t) (\ displaystyle P (t) = v (t) \ i (t) = (\ frac ((V_ (\ mathrm (peak))) ^ (2)) (R)) \ sin ^ (2) (\ omega t)) </Dd> </Dl> <Dd> v (t) = V p e a k sin ⁡ (ω t) (\ displaystyle v (t) = V_ (\ mathrm (peak)) \ sin (\ omega t)) </Dd> <Dd> i (t) = v (t) R = V p e a k R sin ⁡ (ω t) (\ displaystyle i (t) = (\ frac (v (t)) (R)) = (\ frac (V_ (\ mathrm (peak))) (R)) \ sin (\ omega t)) </Dd>

The most common source of alternating voltage is