Basic Qualification · B-005 Basic electronics and theory · B-005-008-001
Lorsqu'on double la puissance, quel est le changement dans le nombre de décibels?
- AUne augmentation de 3 dB
- BUne augmentation de 6 dB
- CUne augmentation de 12 dB
- DUne augmentation de 1 dB
Correct answer: A — Une augmentation de 3 dB. Question tirée de la banque officielle d'ISDE.
Why
Doubling your power output always adds exactly 3 decibels to the signal level, which is a standard rule in radio physics where a 3 dB increase means the power has multiplied by two. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.
Drill B-005 — free, no account