A-Level CAIE Physics A2 21.1.4—Root-mean-square (r.m.s.) and peak values and recall and use I r.m.s. = I0 / Question Bank

• distinguish between root-mean-square (r.m.s.) and peak values and recall and use I r.m.s. = I0 / sqrt(2) and Vr.m.s. = V0 / sqrt(2) for a sinusoidal alternating current