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Topic 21Physics (Cambridge)

Alternating currents

Alternating currents — Cambridge International A Level Physics (9702, Topic 21). Sinusoidal a.c., peak and r.m.s. values, mean power, and rectification with a smoothing capacitor.

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sinusoidal a.c.: peak value, period, frequency and ω = 2πf · r.m.s. value I_rms = I₀/√2 and why it gives the equivalent d.c. heating · mean power = ½ I₀V₀ = I_rms V_rms; peak power = twice the mean · half-wave and full-wave (bridge) rectification · smoothing an a.c. supply with a capacitor across the load

40 min