Multiple choice general knowledge science & technology

Which one of the following is an active element?

  1. 10 V power supply

  2. 25 pF capacitor

  3. 15 kOhm resistor

  4. 10 mH inductor
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A Correct answer
Explanation

An active element can provide power gain or energy to a circuit, such as a power supply. Passive elements like resistors, capacitors, and inductors cannot provide power gain - they store or dissipate energy but cannot supply it independently.

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