Basic Qualification · B-004 Circuit components · B-004-003-011
If a transistor is alternatively driven into saturation and cut-off, what does it behave like?
- A A timer
- B A switch
- C An inverter
- D An amplifier
Correct answer: B — A switch. From the official ISED question bank, verified word for word.
Why
When a transistor is pushed fully on into saturation and then fully off into cut-off, it acts like a light switch that is either completely open or completely closed, allowing current to flow or stopping it entirely. The full explanation — and one for every question — is in Pro.
Practise this section
The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.