Advanced Qualification · A-003 Measurements · A-003-001-003
What is the equivalent to the RMS value of an AC voltage?
- A The AC voltage found by taking the square root of the peak AC voltage
- B The DC voltage causing the same heating of a given resistor as the peak AC voltage
- C The AC voltage found by taking the square root of the average AC value
- D The AC voltage causing the same heating of a given resistor as a DC voltage of the same value
Correct answer: D — The AC voltage causing the same heating of a given resistor as a DC voltage of the same value. From the official ISED question bank, verified word for word.
Why
RMS stands for root mean square, which is the AC voltage that delivers the same amount of heat to a resistor as a DC voltage of the same numerical value. 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.