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How do a transistor works as a switch?

In: Electronics Engineering [Edit categories]

Answer:

A transistor operates as a switch by operating it outside of its linear range.

Basically, if you apply less voltage across the base-emitter junction than required to turn in on, then it is off, and if you apply more current through the base-emitter junction than collector-emitter current divided by hFe, then then it is on and saturated, fully outside of its linear range.

First answer by Alex146. Last edit by Alex146. Contributor trust: 419 [recommend contributor ]. Question popularity: 1 [recommend question].

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