Basic Qualification · B-005 Basic electronics and theory · B-005-011-004
Un transformateur comporte un primaire de 250 tours et un secondaire de 500 tours. Si la tension appliquée au primaire est de 120 volts, quelle tension apparaît aux bornes de son secondaire?
- A620 V
- B60 V
- C240 V
- D480 V
Correct answer: C — 240 V. Question tirée de la banque officielle d'ISDE.
Why
The secondary voltage is 240 volts because the transformer doubles the input voltage when the secondary coil has twice as many wire turns as the primary coil. 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