Advanced Qualification · A-003 Measurements · A-003-001-004
Pour une onde sinusoïdale de 100 Hz, si la tension de crête est de 20 volts, sa valeur efficace ("RMS") est de :
- A7,07 volts
- B16,38 volts
- C14,14 volts
- D28,28 volts
Correct answer: C — 14,14 volts. Question tirée de la banque officielle d'ISDE.
Why
For a smooth sine wave like this 100 Hz signal, the root mean square, or RMS, value represents the equivalent steady voltage that would deliver the same power to a heater. 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