Basic Qualification · B-005 Basic electronics and theory · B-005-012-006
In a parallel-resonant circuit at resonance, the circuit has:
- A high impedance
- B low impedance
- C low mutual inductance
- D high mutual inductance
Correct answer: A — high impedance. From the official ISED question bank, verified word for word.
Why
At resonance in a parallel circuit, the inductor and capacitor cancel each other out, causing the current drawn from the source to drop to a minimum. 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.