Link to our latest notes and resources: https://drive.google.com/drive/u/2/folders/15FnZdp3NJ15WmXnkrSWgi5ltd5rUI9Bg 21 Alternating currents An understanding of the practical and economic advantages of transmission of power by electricity from Cambridge IGCSE / O Level Physics or equivalent is assumed. 21.1 Characteristics of alternating currents Candidates should be able to: 1 understand and use the terms period, frequency and peak value as applied to an alternating current or voltage 2 use equations of the form x = x0 sin ωt representing a sinusoidally alternating current or voltage 3 recall and use the fact that the mean power in a resistive load is half the maximum power for a sinusoidal alternating current 4 distinguish between root-mean-square (r.m.s.) and peak values and recall and use I r.m.s. = I0 / 2 and Vr.m.s. = V0 / 2 for a sinusoidal alternating current 21.2 Rectification and smoothing Candidates should be able to: 1 distinguish graphically between half-wave and f

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