Question

How does the Transistor act as a Switch?

Answer 1

Explanation:

There are three useful regions of operation of a transistor namely saturation region, cutoff region & active region.

• In the active region, the transistor acts as an amplifier.

• In the saturation region, the transistor acts as a closed switch.

• In the cutoff region, the transistor acts as an open switch.

So to use a transistor as a switch, it needs to be operated in the saturation & cutoff region.

Answer 2

Answer:

By turning a small input current into a large output current, the transistor acts like an amplifier. But it also acts like a switch at the same time. When there is no current to the base, little or no current flows between the collector and the emitter. ... So the base current switches the whole transistor on and off.

Hope it helps..