Basic Qualification · B-005 Basic electronics and theory · B-005-012-007
In a series resonant circuit at resonance, the circuit has:
- A high mutual inductance
- B low impedance
- C high impedance
- D low mutual inductance
Correct answer: B — low impedance. From the official ISED question bank, verified word for word.
Why
At resonance in a series circuit, the opposing effects of the inductor and capacitor cancel each other out, leaving only the small resistance of the wires to stop the flow of current. 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.