Basic Qualification · B-005 Basic electronics and theory · B-005-010-003
The reactance of capacitors increases as:
- A applied voltage increases
- B applied voltage decreases
- C frequency increases
- D frequency decreases
Correct answer: D — frequency decreases. From the official ISED question bank, verified word for word.
Why
Capacitors resist the flow of alternating current more when the signal changes slowly, meaning their opposition, called reactance, grows as the frequency drops. 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.