Discussion
Assertion (A): Assertion: Class A dissipation is greatest with no signal applied.
Reason (R): Reason: Its quiescent current flows whether or not a signal is present.
Select the correct answer from the options below.
Answer: D
Both are true and the second is the reason: the standing current draws constant power from the supply, and whatever is not delivered to the load is dissipated, so idle is the worst case. That is the exact reverse of class B, and it means the two classes are sized from opposite ends of their operating range. Knowing which condition is worst for a given class is what turns a rating into a heatsink.
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