Characteristics of alternating currents

What the syllabus asks of you

• understand and use the terms period, frequency and peak value as applied to an alternating current or voltage
• use equations of the form x = x0 sin ωt representing a sinusoidally alternating current or voltage
• recall and use the fact that the mean power in a resistive load is half the maximum power for a sinusoidal alternating current
• distinguish between root-mean-square (r.m.s.) and peak values and recall and use Ir.m.s. = I0 / √2 and Vr.m.s. = V0 / √2 for a sinusoidal alternating current