Advanced Qualification · A-003 Measurements · A-003-001-008
Un voltmètre à courant alternatif est étalonné pour indiquer la valeur :
- Aefficace ("RMS")
- Bcrête à crête
- Cmoyenne
- Dde crête
Correct answer: A — efficace ("RMS"). Question tirée de la banque officielle d'ISDE.
Why
An AC voltmeter is calibrated to read the effective value because this number tells you the same amount of work a direct current would do, making it the standard for measuring power in circuits. 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