30 joules of electrical energy bulb generates 20 joules of light energy. How much energy is lost? What is the form of the lost ? What is the form of the lost energy? Find the efficiency of the bulb.
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since Q1 is 30 joule and Q2 is 20 joule
(1) mean lost in energy is 30-20=10joule, which is lost in form of light energy
(2) efficiency is given by
η=1-Q2/Q1
η=1-20/30
η=1-0.66
η=0.34
η=0.4
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