Advanced Qualification · A-001 Advanced theory · A-001-001-008
What is the time constant of a circuit having a 100 microfarad capacitor in series with a 470 kilohm resistor?
- A 4700 seconds
- B 470 seconds
- C 0.47 seconds
- D 47 seconds
Correct answer: D — 47 seconds. From the official ISED question bank, verified word for word.
Why
The time constant equals the resistance multiplied by the capacitance. 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.