Basic Qualification · B-005 Basic electronics and theory · B-005-006-006
Si l'on double la tension appliquée à deux résistances en série, de combien change la puissance totale?
- AElle diminue à un quart
- BElle quadruple
- CElle diminue de moitié
- DElle double
Correct answer: B — Elle quadruple. Question tirée de la banque officielle d'ISDE.
Why
When you double the voltage across resistors in series, the power they consume increases four times because power depends on the square of the voltage. 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