Physics Topic: Alternating Current

Show an understanding and use the terms period, frequency, peak value and rootmeansquare value as applied to an alternating current or voltage.

Deduce that the mean power in a resistive load is half the maximum power for a sinusoidal alternating current.

Represent an alternating current or an alternating voltage by an equation of the form x = x_{o} sin wt.

Distinguish between r.m.s. and peak values and recall and solve problems using the relationship I_{rms} = I_{o} / sqrt(2) for the sinusoidal case.

Show an understanding of the principle of operation of a simple ironcored transformer and recall and solve problems using N_{s} / N_{p} = V_{s} / V_{p} = I_{p} / I_{s} for an ideal transformer.

Explain the use of a single diode for the halfwave rectification of an alternating current.