1) What useful energy transfer does this do? a) energy => electricity b) heat => electricity c) light => electricity d) electrical => light e) light => heat f) light => electrical 2) 100J of electrical energy go into a bulb, 20J are converted to light. How many are transferred as heat? a) 20J b) 40J c) 60J d) 80J e) 100J f) 120J 3) What do we measure energy in when we are in science? a) Calories b) Units c) Joules d) Amps e) Volts f) Metres 4) 200J of chemical energy are in a candle. 20J are transferred as light. What is the efficiency of the candle? a) 10% b) 20% c) 40% d) 60% e) 80% f) 100% 5) 100J of electrical energy enters a light bulb. 80% of that energy is wasted as heat. How many joules of energy are transfered as light? a) 10J b) 20J c) 30J d) 40J e) 50J f) 60J 6) 500J of electrical energy is transferred to a laptop. What is the waste energy? a) Kinetic b) Heat c) Light d) Sound e) Magnetic 7) 500J of electrical energy is transferred to a laptop. 150J is wasted. What is it's efficiency? a) 40% b) 50% c) 60% d) 70% e) 80% f) 90% 8) What type of energy is the input energy for a coal power station? a) Kinetic b) Heat c) Chemical d) Sound e) Gravity f) Thermal 9) What is the useful energy transfer for a hydroelectric dam? a) Chemical => Sound b) Gravitational => Electrical c) Kinetic => Sound d) Voltage => Current e) Elastic => kinetic f) Chemical => Electrical 10) What is the useful energy transfer in a nuclear reactor? a) Nuclear > heat b) Nuclear > sound c) Nuclear > chemical d) Electrical > Nuclear e) Electrical > sound f) Electrical > heat 11) Which of these is most efficient? a) A filament light bulb b) An energy saving light bulb 12) Which is the odd one out? a) Solar b) Hydroelectric c) Geothermal d) Coal e) Wind turbine f) Wave power 13) Which is the odd one out? a) Coal power station b) Oil power station c) Gas power station d) Wood power station e) Nuclear power station 14) What is the useful output energy from a solar panel? a) Electrical b) Light 15) How do you calculate speed? a) S= D X T b) S = T/D c) S = D/T d) S = T X D

SP JC Energy efficiency

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