Advanced Qualification · A-001 Advanced theory · A-001-001-009
What is the time constant of a circuit having a 470 microfarad capacitor in series with a 470 kilohm resistor?
- A470 seconds
- B221 seconds
- C221 000 seconds
- D47 000 seconds
Correct answer: B — 221 seconds. From the official ISED question bank, verified word for word.
Why
The time constant is found by multiplying the resistance in ohms by the capacitance in farads. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory is section A-001 of the Advanced exam: Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.
Drill A-001 — free, no account