Advanced Qualification · A-001 Advanced theory · A-001-005-006
What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 10.1 microhenrys and R is 100 ohms?
- A 0.221
- B 22.1
- C 0.00452
- D 4.52
Correct answer: A — 0.221. From the official ISED question bank, verified word for word.
Why
The value 0.221 is correct because the quality factor, or Q, of a parallel circuit measures how sharply it resonates by comparing the resistance to the reactance. 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.