Basic Qualification · B-005 Basic electronics and theory · B-005-011-007
L'enroulement primaire d'un transformateur consomme 10 watts. En négligeant les pertes, si la tension à l'enroulement secondaire est de 5 volts, quel est le courant dans l'enroulement secondaire?
- A5 ampères
- B2 ampères
- C0,5 ampère
- D1 ampère
Correct answer: B — 2 ampères. Question tirée de la banque officielle d'ISDE.
Why
Since the transformer has no losses, the power going in equals the power coming out, meaning the secondary side must also deliver 10 watts. 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