SSC
PHYSICS
Question
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Equation for efficiency

(useful energy / total energy) x 100%


(total energy / useful energy) x 100%


(waste energy / total energy) x 100%


(useful energy / waste energy) x 100%

Explanation:
Detailed explanation1: Since efficiency is given by: Efficiency=Useful energy outputTotal energy input×100% Efficiency = Useful energy output Total energy input × 100 %, we have to find the useful energy output. In this case, the useful energy output is the lifting of the 10 N load through 5 m.
Detailed explanation2: We can calculate the efficiency of anything by dividing the energy input and the energy output by 100%. We use this equation generally to represent the energy in the form of heat or power.
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