amplifier question please help Amplifiers transfer function

amplifier question please help

Amplifiers, transfer function, frequency response and Bode plots P,\' An amplifier operating from a dual ±10 V supply provides an 8-volt peak-to-peak sine-wave signal to a 400 Ohms load and draws negligible input current from the signal source. The DC current drawn from each positive and negative supply is 8 mA. What is the power dissipated in the amplifier, and what is the amplifier efficiency? Do not forget to include units. (3+3) points

Solution

Ans) Output Power= Po=Vrms²/R_L

Gine Vo(peak-peak)= 8 V

Vo(Rms)=8/(2*sqrt(2))=8/(2*1.414)=2.83 V

Po=Vo²/R_L=2.83²/400=0.02 W (Watts)

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Input Power Pi=2*Vs*Is=2*10*8m=0.16 W

Efficiency=Po/Pi=0.02/0.16=0.125 means 12.5%