Advanced Qualification · A-003 Measurements · A-003-001-006
Pour une onde sinusoïdale, la valeur efficace de tension ou de courant mesure :
- A100 % de la valeur maximale
- B63,6 % de la valeur maximale
- C70,7 % de la valeur maximale
- D50 % de la valeur maximale
Correct answer: C — 70,7 % de la valeur maximale. Question tirée de la banque officielle d'ISDE.
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 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