Q. The maximum efficiency of resistance loaded class A power amplifier is __

A
5%
B
35%
C
25%
D
50%
Solution:

The theoretical maximum efficiency of a Class A power amplifier is 50%. In practice, with the capacitive coupling and inductive loads (loudspeakers), the efficiency can decrease as low as 25%. This means 75% of power drawn by the amplifier from the supply line is wasted.

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