Advanced Qualification · A-003 Measurements · A-003-001-006
The effective value of a sine wave of voltage or current is:
- A 100% of the maximum value
- B 63.6% of the maximum value
- C 70.7% of the maximum value
- D 50% of the maximum value
Correct answer: C — 70.7% of the maximum value. From the official ISED question bank, verified word for word.
Why
The effective value, also called RMS, represents the steady DC voltage that would deliver the same heating power to a resistor as the changing AC sine wave does. 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.