Discussion
Assertion (A): Assertion: An emitter follower is useless because it has no voltage gain.
Reason (R): Reason: Its output voltage follows its input almost exactly.
Select the correct answer from the options below.
Answer: C
The reason is true and the assertion is false: the follower's value lies in transforming impedance - high looking in, low looking out - which lets a delicate source drive a demanding load. Voltage gain is only one service a stage can provide. Judging a circuit by the one specification it does not offer is a mistake worth guarding against generally, and buffers are where it is made most often.
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