Verified Solution • 2025–26 Session moderate

QPages 416-417: Q11: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 416-417: Q11 Solution: Consider an amplifier circuit using a transistor. The output…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often treat the input signal as the source of the extra output power, overlooking that the transistor draws energy from the DC supply. Remember that an amplifier’s power gain comes from the external power source, while the input merely controls the flow of that energy.

Consider an amplifier circuit using a transistor. The output power is several times greater than the input power. Where does the extra power come from?

Step-by-Step Verified Solution

**Answer:** The extra power comes from the DC power supply (battery) connected to the amplifier. **Step-by-Step Explanation:** The transistor amplifier takes energy from the DC power supply and controls the output current to match the input signal's variations but with greater amplitude. The input signal only controls the flow of energy from the supply; it does not supply the output power .

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