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Re my circuit BJT AMPLIFIER YOUTUBE FESZ 1, I am having problems with power and current measurements. Some power measurements such as P(R4)) do give the power dissipated in R4. But P(V2) is zero so is not giving the power provided by the source V2. MAG(I(V2)) does show current from V2 but it is 300mW at low frequencies and reduces to zero midway thru the working frequency range of the amplifier. If true that would mean infinite efficiency (finite power out but zero power from source) so is unlikely to be true. Could you tell me the correct way to measure the power provided by a DC source V2.