Basic Qualification · B-005 Basic electronics and theory · B-005-006-008
Combien de courant consomme une ampoule de 30 watts fonctionnant à 12 volts?
- A2,5 ampères
- B18 ampères
- C4,8 ampères
- D0,4 ampère
Correct answer: A — 2,5 ampères. Question tirée de la banque officielle d'ISDE.
Why
To find the current, divide the power in watts by the voltage in volts. 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