Homework Answers
(a)
Power = voltage x current
Power consumption is 120v x 1.8A = 216 watts.
(b)
All the power that isn't converted to output is lost as heat, so if the system consumes 216 watts and produces 50 watts, the heat loss is 166 watts.
Efficiency is the ratio between input power and output power, expressed as a percentage.
Efficiency = (50/216) x 100
Efficiency = 23.1481 %
Efficiency 
23.15
%
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