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

explain the use of four diodes (bridge rectifier) for the full-wave rectification of an alternating current

analyse graphs of the variation with time of potential difference, charge and current for a capacitor discharging through a resistor