Question

A 150 W driveway light produces 9.3 × 104

J of light energy
over a 4.0 h period. If the light uses 2.06 × 106
J of energy in
the 4.0 h, then what is its efficiency?

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Answer 1

4.51456%

Explanation:

Efficiency equation: output/input*100%

(9.3*10^4)/(2.03*10^6)*100 = 4.51456%