Question detail
A machine has a useful energy output of 1500 J and a total energy input of 2000 J. Calculate the efficiency of the machine.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Conservation and dissipation of energy
Question
A machine has a useful energy output of 1500 J and a total energy input of 2000 J. Calculate the efficiency of the machine.
Answer
0.75 or 75%
Explanation
This answer stays anchored to Efficiency and uses the approved objective: Calculate efficiency using useful energy output divided by total energy input..
Common mistake
Confusing Efficiency Calculation
Students often confuse the formula for efficiency by using total energy output instead of useful energy output.
Remember to use the formula: efficiency = useful energy output / total energy input.
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