Basic Qualification · B-005 Basic electronics and theory · B-005-010-002
How does a capacitor react to AC?
- A As the amplitude of the applied AC increases, the reactance increases
- B As the amplitude of the applied AC increases, the reactance decreases
- C As the frequency of the applied AC increases, the reactance decreases
- D As the frequency of the applied AC increases, the reactance increases
Correct answer: C — As the frequency of the applied AC increases, the reactance decreases. From the official ISED question bank, verified word for word.
Why
A capacitor resists the flow of alternating current, but this resistance, called reactance, drops when the signal changes direction faster. 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.