Radio Amateur Quiz Canadian License

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Question A-004-004-001

In a series-regulated power supply, the power dissipation of the pass transistor is:

Correct Answer

directly proportional to the load current and the input/output voltage differential

Explanation

The pass transistor in a series linear regulator drops the voltage difference between input (Vin) and output (Vout). Power dissipated in it is P = (Vin - Vout) × I_load. Thus, dissipation increases with load current and the voltage differential.

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