The power amplifier works on the basic principle of converting the DC power drawn from the power supply into an AC voltage signal delivered to the load. Although the amplification is high the efficiency of the conversion from the DC power supply input to the AC voltage signal output is usually poor. The perfect or ideal amplifier would give us an efficiency rating of 100% or at least the power IN would be equal to the power OUT. However, this can never happen as some of its power is lost in the form of heat and also, the amplifier itself consumes power during the amplification process.
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