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Transistor when used as a power amplifier is generally mounted on a metallic plate so as to

Transistor when used as a power amplifier is generally mounted on a metallic plate so as to Correct Answer dissipate the excessive heat developed during working

Power Amplifier:

  • Power amplifiers deal with high voltage amplification (in Volts range instead of normal mV range). generating a lot of heat.
  • Since metals are good thermal conductors, the transistors used in them are mounted on the metallic plate as they help radiate the heat dissipated from transistors.
  • Power amplifiers are also having low output impedance to match to the load. 
  • The common collector or emitter follower circuit is normally used as the power amplifier because it has a low o/p impedance. 
  • Due to the use of heat sinks and large size power transistors, the power amplifiers’ become bulky.
  • A transformer may also be used for impedance matching on the o/p side.​

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