Advanced Qualification · A-001 Advanced theory · A-001-005-005
What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 8.2 microhenrys and R is 1 kilohm?
- A 0.273
- B 2.73
- C 36.8
- D 0.368
Correct answer: B — 2.73. From the official ISED question bank, verified word for word.
Why
The value 2.73 is correct because the quality factor, or Q, of a parallel circuit measures how sharply it resonates by comparing the resistance to the inductive reactance 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.