Quiz: Efficiency Definition
AQA GCSE Physics 8463
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Building on what you've learned about energy transfers and conservation, let's test your knowledge of efficiency and how it relates to energy transfer!
What is the definition of efficiency?
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Which of the following statements about efficiency are correct? (Select all that apply)
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Efficiency is calculated as useful energy {{blank0}} by total energy {{blank1}}.
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Match the items on the left with their correct pairs on the right
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A machine uses 500 J of energy but only converts 200 J into useful energy. What is its efficiency?
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If a machine has an efficiency of 80%, what does this mean?
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Match the items on the left with their correct pairs on the right
Which of the following is the correct formula for efficiency?
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Which of these methods increase efficiency? (Select all that apply)
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A lightbulb uses 60 J of electric energy and produces 15 J of light energy. What is its efficiency?
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