Advanced Qualification · A-001 Advanced theory · A-001-001-003
What is the term for the time required for the current in an RL circuit to build up to 63.2% of the maximum value?
- AA time factor of one
- BOne exponential rate
- COne time constant
- DAn exponential period of one
Correct answer: C — One time constant. From the official ISED question bank, verified word for word.
Why
In an RL circuit, which contains resistance and inductance, the current does not jump instantly to its full strength but rises gradually. 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