Advanced Qualification · A-003 Measurements · A-003-001-007
Les échelles d'un voltmètre CA sont habituellement étalonnées pour donner :
- Ala tension de crête
- Bla tension instantanée
- Cla tension moyenne
- Dla tension efficace ("RMS")
Correct answer: D — la tension efficace ("RMS"). Question tirée de la banque officielle d'ISDE.
Why
AC voltmeter scales show RMS voltage because this value tells you the equivalent direct current that would produce the same heating effect in a resistor. The full explanation — and one for every question — is in Pro.
Practise this section
Measurements is section A-003 of the Advanced exam: Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.
Drill A-003 — free, no account