Basic Qualification · B-005 Basic electronics and theory · B-005-010-006
What circuit parameter change causes an inductor's reactance to increase?
- A A decrease in frequency
- B An increase in current
- C An increase in voltage
- D An increase in frequency
Correct answer: D — An increase in frequency. From the official ISED question bank, verified word for word.
Why
An inductor resists changes in current, and when the frequency of the signal rises, the current changes direction faster, making the inductor push back harder. 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.