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Chapter 1, Problem 11E Step-by-step solution Step 1 of 2 Calculate the DC power. Substitute 15 for V and for =(15)(8x10⁻³) =120 mW Calculate the power delivered to the load. = R Substitute for and for Step 2 of 2 Calculate the power dissipated in the amplifier. Pdissipated Substitute 18 mW for and 120 mW for = 120 m- 18 m = 102 mW Therefore, the power dissipated in the amplifier, Pdissipated is 102 mW Calculate the efficiency. Substitute 18 mW for and 120 mW for 120 =15% Therefore, the efficiency of an amplifier, n is 15%