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Question

A transistor is essentially


A

a voltage-operated device

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B

resistance operated device

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C

a current operated device

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D

power-driven device

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Solution

The correct option is C

a current operated device


Transistor:

  1. A bipolar transistor generates a large collector current by amplifying a small current entering the base, because the collector current is controlled by the base current, it is a current-driven device.
  2. The collector-emitter voltage affects the current gain.
  3. A bipolar transistor provides a gain known as a DC current gain in the active region shown in the right-hand figure. Regardless of the collector-emitter voltage, the collector current remains nearly constant in this region.
  4. In the saturation region, on the other hand, a bipolar transistor has a DC current gain of only 10 to 20, and the collector current varies significantly with collector-emitter voltage.

Therefore, a transistor is essentially a current-operated device.


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