1) Efficiency is defined as a) the rate of transfer of energy b) cannot be created or destroyed c) percentage of useful energy acheived d) decreases with increased lubrication 2) Could you ever have a device that provides an efficiency of over 100% a) Yes if it is is really well lubricated b) No, it would violate the law of conservation of energy 3) Efficiency is increased by (tick all that are true) a) reducing wasted energy b) increasing lubrication c) reducing heat loss by insulation d) going slower e) Increasing the voltage 4) Efficiencies can be quoted as a decimal or a percentage a) True b) False 5) Efficiency is calculated as a) Useful energy output/wasted energy output b) Useful energy output/total energy output c) Wasted energy output/total energy output 6) Calculate the efficiency of a petrol engine that transforms 1000 J of chemical potential energy into 300 J of kinetic energy, and 700 J into wasted heat and sound energy. a) 3 % b) 70 % c) 50% d) 30 %

Efficiency Review

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