The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
Correct answer: D. 20 W
- A. 10 W
- B. 15 W
- C. 5 W
- D. 20 W
Explanation
A transformer-coupled Class A amplifier has a maximum theoretical efficiency of 50%, so producing 10 W of a.c. output requires at least 20 W of transistor input power rating. The 10 W option confuses output power with the required device rating.
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