CAIE A-Level Physics 21.1.2 Sinusoidal A.C. Equations

Practise using x = x₀ sin ωt to calculate instantaneous alternating current or voltage, interpreting amplitude, angular frequency, time and phase.

Exam points

use x = x₀ sinωt to calculate instantaneous current or voltage
rearrange or interpret the sinusoidal equation to determine amplitude, angular frequency, time or phase

[Maximum number: 1]

The output potential difference (p.d.) of an alternating power supply is represented by

V=320 \sin (100 \pi t)

where V is the p.d. in volts and t is the time in seconds.

Determine the period T of the output.

$\omega=100 \pi$ $T=\frac{2 \pi}{\omega}=\frac{2 \pi}{100 \pi}$

C1

=0.020 s

A1

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