Advanced Qualification · A-001 Advanced theory · A-001-005-003
What is the Q of a parallel RLC circuit, if it is resonant at 4.468 MHz, L is 47 microhenrys and R is 180 ohms?
- A 13.3
- B 0.136
- C 7.35
- D 0.00735
Correct answer: B — 0.136. From the official ISED question bank, verified word for word.
Why
The value 0.136 is correct because the quality factor, or Q, for a parallel circuit measures how sharply it resonates by dividing the resistance by the reactance of the inductor at the specific frequency. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.