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Card 6
Front
Why does 'wasted energy' become less useful?
Back
Card 7
Front
In a certain device, 25% of the energy is usefully transferred. What is the energy efficiency of this device?
Back
Card 8
Front
A coal-fired power station is 40% efficient. What does this mean?
Back
Card 9
Front
Using Source C, how much energy is transferred by a 500 W electric drill in 30 seconds?
Back
Card 10
Front
A 250 W computer is switched on for 4 hours. How many Units of electricity does it use?
Back
Card 11
Front
A 2 kW electric fire is switched on for 30 minutes. How many Units of electricity does it use?
Back
Card 12
Front
If one Unit of electricity costs 10p, how much will 30 units cost?
Back
Card 13
Front
What is the distance from the crest of one wave to the crest of the next wave called?
Back
Card 14
Front
What are the units of frequency?
Back
Card 15
Front
What is the direction of a light wave to the direction of enerfy transfer?
Back
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