Question detail
What is the formula to express efficiency as a percentage?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Conservation and dissipation of energy
Question
- A. Efficiency = (useful energy output / total energy input) x 100
- B. Efficiency = (total energy input / useful energy output) x 100
- C. Efficiency = (useful energy output + total energy input) x 100
- D. Efficiency = (total energy input - useful energy output) x 100
Answer
Efficiency = (useful energy output / total energy input) x 100
Explanation
The correct option is "Efficiency = (useful energy output / total energy input) x 100". Efficiency = (useful energy output / total energy input) x 100 is right because it directly matches Efficiency: Express efficiency as a percentage.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.
Common mistake
Confusing Efficiency Representation
Students often express efficiency as a decimal instead of a percentage, leading to incorrect answers.
To express efficiency as a percentage, multiply the decimal value by 100.
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