Basic Qualification · B-005 Basic electronics and theory · B-005-012-011
What happens to current when a series RLC circuit is tuned to the frequency of the source?
- A It reaches maximum
- B It is limited by inductive reactance
- C It is limited by capacitive reactance
- D It reaches minimum
Correct answer: A — It reaches maximum. From the official ISED question bank, verified word for word.
Why
When a series RLC circuit tunes to the source frequency, the opposing effects of the inductor and capacitor cancel each other out, leaving only the resistance to limit the flow. 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.