A resistor makes it harder for the electrons to pass and some of their energy is transferred into heat by the resistor
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In a filament lamp, in what form is most of the energy lost?
Heat
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Why is this the right answer>
The filament is a resistance wire that is designed to become so hot that it emits energy in the visible light part of the spectrum
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What is power?
The rate at which energy is transferred
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What is the formula for 'power'?
P = E⁄t
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Explain what this equation means
Power = Energy divided by time (watts = kilojoules divided by seconds)
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Calculate the power of an appliance that uses 1000 joules of energy in 5 seconds.
200 W
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Explain how you calculated that answer
Power is the rate at which energy is transferred therefore you need to divide the energy by the time during which it was being transferred.
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Power, potential difference and current are correctly related by which equation?
P = I x V
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What is the voltage of an appliance if it uses 200 J per second when supplied with a current of 5 A?
40 V
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Which equation correctly shows the relationship between energy transferred, voltage and charge?
E = V x Q
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What is the energy transferred if the voltage is 5 V and the charge is 10 C?
50 J - Whilst you would get a mark for answering 50 you would lose a mark for not giving units with your answer. If you are struggling to calculate an answer to a numerical question, always put a number with the correct units! At least you will get a mark
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What size of fuse would be required for a 230 V, 500 W heater?
3 A
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Other cards in this set
Card 2
Front
In a filament lamp, in what form is most of the energy lost?
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