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A simple string light produces 10 J of light energy each second. What is the efficiency of the light bulb if it uses up 200 J each second? Show work A. 5% B. 10% C. 20% D. 25%
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A simple string light produces 10 J of light energy each second. What is

the efficiency of the light bulb if it uses up 200 J each second? Show work

A. 5%
B. 10%
C. 20%
D. 25%

User Pseudoremy
by
5.1k points

1 Answer

5 votes
In this situation, the useful energy output=10J, the total energy input=200J

Efficiency=useful energy output/total energy input*100%=10/200*100%=5%

Choice A is correct
User Dum
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