Discussion
Assertion (A): Assertion: Class B dissipation is greatest at full output.
Reason (R): Reason: The output current is largest at full output.
Select the correct answer from the options below.
Answer: C
The reason is true but the assertion is false: dissipation is the difference between what the supply delivers and what the load takes, and that difference peaks at roughly two thirds of full swing. At full output most of the power is reaching the load, and at idle almost nothing flows. That the worst thermal case is neither extreme is the single most useful fact for sizing a class B heatsink, and testing only at full power understates the requirement.
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