Basic Qualification · B-005 Basic electronics and theory · B-005-010-011
In general, the reactance of inductors increases with:
- A decreasing applied voltage
- B increasing applied voltage
- C increasing AC frequency
- D decreasing AC frequency
Correct answer: C — increasing AC frequency. From the official ISED question bank, verified word for word.
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
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.