Advanced Qualification · A-003 Measurements · A-003-001-002
What is the RMS value of a 340 volt peak-to-peak pure sine wave?
- A 300 volts
- B 120 volts
- C 170 volts
- D 240 volts
Correct answer: B — 120 volts. From the official ISED question bank, verified word for word.
Why
To find the root mean square, or RMS, value which represents the equivalent direct current heating effect, you first divide the 340 volt peak-to-peak measurement by two to get the peak voltage of 170 volts. 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.