AQA · Physics · 8463
GCSE Physics: Energy transfers in everyday appliances
Electricity · AQA GCSE Physics (8463), specification point 4.2.4.2. Cards are generated from the exam board's own specification for "Energy transfers in everyday appliances", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What two factors determine how much energy an electrical appliance transfers?
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The power of the appliance and how long it is switched on for.
What is the equation linking energy transferred, power and time?
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E = P t (energy transferred = power × time).
What is the equation linking energy transferred, charge flow and potential difference?
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E = Q V (energy transferred = charge flow × potential difference).
In a circuit, work is done when ? flows.
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charge
What is the SI unit of energy transferred, E?
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The joule (J).
What is the SI unit of charge flow, Q?
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The coulomb (C).
What is the SI unit of power, P?
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The watt (W).
What is the SI unit of potential difference, V?
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The volt (V).
How is the power of a circuit device related to potential difference and current?
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Power equals potential difference multiplied by current (P = V I).
Into which energy store does an electric motor transfer electrical energy?
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The kinetic energy store (of the moving parts).
Why does a higher power rating mean an appliance transfers more energy per second?
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Power is the energy transferred per unit time, so a higher power rating means more energy moved each second from the supply to the appliance's stores.
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