Basic Qualification · B-005 Basic electronics and theory · B-005-010-011
En général, la réactance d'une inductance augmente lorsque:
- Ala fréquence diminue
- Bla tension appliquée diminue
- Cla tension appliquée augmente
- Dla fréquence augmente
Correct answer: D — la fréquence augmente. Question tirée de la banque officielle d'ISDE.
Why
Inductors resist changes in current, and when the AC frequency rises, the current changes direction more rapidly, forcing the inductor to push back harder; this opposition is called reactance, so it grows as the frequency increases. 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