Physics – 1.7.3 Energy resources | e-Consult
1.7.3 Energy resources (1 questions)
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Solution:
Total energy input = 2000 J
Useful energy output = 1500 J
Efficiency = (useful energy output) / (total energy input) × 100%
Efficiency = (1500 J) / (2000 J) × 100%
Efficiency = 0.75 × 100%
Efficiency = 75%