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Card 6
Front
The specific heat capacity of water is 4181 J/kg/°C and that of lead is 128 J/kg/°C. This means:
Back
Card 7
Front
Insulating a home costs £1800 and saves £50 a year. What is the payback time?
Back
Card 8
Front
The useful energy transfer that happens in an electric lamp is:
Back
Card 9
Front
'Wasted energy' becomes less useful because:
Back
Card 10
Front
Which equation can be used to calculate the efficiency of an energy transfer?
Back
Card 11
Front
In a certain device, 25% of the energy is usefully transferred. The energy efficiency of this device is:
Back
Card 12
Front
A coal-fired power station is 40% efficient. This means that:
Back
Card 13
Front
The energy transferred by an electrical appliance can be calculated using this equation:
Back
Card 14
Front
How much energy is transferred by a 500 W electric drill in 30 seconds?
Back
Card 15
Front
A 250W computer is switched on for 4 hours. How many Units of electricity does it use?
Back
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