While the resonant frequency of a tuned circuit is a single frequency, the effect of resonance is significant over a certain range of frequencies. What is this range called?

Why

Bandwidth is the correct term because it describes the span of frequencies around a circuit's resonant point where the signal remains strong enough to be useful, rather than dropping off immediately. The full explanation — and one for every question — is in Pro.

Practise this section

Basic electronics and theory is section B-005 of the Basic exam: 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.

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