Advanced Qualification · A-003 Measurements · A-003-001-004

If the peak value of a 100 Hz sinusoidal waveform is 20 volts, the RMS value is:

1. A 16.38 volts
2. B 14.14 volts
3. C 28.28 volts
4. D 7.07 volts

Correct answer: B — 14.14 volts. From the official ISED question bank, verified word for word.

Why

For a smooth sine wave like this 100 Hz signal, the root mean square, or RMS, value represents the equivalent steady voltage that would deliver the same power to a heater. The full explanation — and one for every question — is in Pro.

Practise this section

Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.

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