Advanced Qualification · A-001 Advanced theory · A-001-005-007
What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 12.6 microhenrys and R is 22 kilohms?
- A 39
- B 22.1
- C 0.0256
- D 25.6
Correct answer: A — 39. From the official ISED question bank, verified word for word.
Why
The value 39 is right because the quality factor, or Q, measures how sharply a circuit resonates by comparing the energy stored to the energy lost. 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.