1) What is the ideal energy efficiency? a) 100% b) 30% c) 0% d) 50% 2) A certain process produces 300 Joules of energy from an input of 1,200 Joules of energy. What is its energy efficiency? a) 20% b) 25% c) 30% d) 70% 3) A man expends 100J of work to move a box up an inclined plain. The amount of work produced is 80J. What is the man's efficiency? a) 80% b) 20% c) 800% d) 78% 4) A wind turbine generates 100 joules of electricity from a gust of wind which has 300 joules of energy. How efficient is the turbine? a) 10% b) 33% c) 50% d) 66% 5) A solar panel is 20% efficient at converting light energy into electricity. If it generates 200 joules of electrical power, how much power is wasted? a) 500 J b) 750 J c) 800 J d) 1000 J 6) An LED converts around 80% of the energy supplied to it into light. How much energy is converted into light if a total of 50 J is supplied to it? a) 30 J b) 40 J c) 50 J d) 60 J 7) Calculate the efficiency of a heater which can convert 700 joules of chemical energy into 175 joules of heat energy. a) 10% b) 25% c) 35% d) 50%

Efficiency calculation

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