If a transistor is alternatively driven into saturation and cut-off, what does it behave like?

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

Circuit components is section B-004 of the Basic exam: The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.

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