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1.7 Energy And Effeciency (Year 10 Physics)
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What kind of energy is usually wasted when there is friction between moving parts?
If an appliance is 10% efficient and 300J of energy are given to it, what is the useful energy output?
An electric motor has a percentage efficiency of 60%. If the total energy supplied is 100J, how much useful energy is delivered?
Which formula correctly calculates percentage efficiency?
Why does every mechanical system generate heat?
What happens to the efficiency if frictional forces increase?
In energy transfer, what is the `input energy`?