AQA · Physics · 8463
GCSE Physics: Power
Electricity · AQA GCSE Physics (8463), specification point 4.2.4.1. Cards are generated from the exam board's own specification for "Power", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What is the equation linking power, potential difference and current?
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P = V I (power = potential difference × current).
What is the equation linking power, current and resistance?
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P = I² R (power = current² × resistance).
Electrical power = potential difference × ?.
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current
Electrical power = current² × ?.
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resistance
What is the SI unit of electrical power?
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The watt (W).
What is the unit of potential difference?
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The volt (V).
What is the unit of electric current?
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The ampere (A), commonly called the amp.
What is the unit of electrical resistance?
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The ohm (Ω).
Why does doubling the current through a fixed resistor quadruple the power?
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Because P = I² R — power is proportional to the square of the current, so 2× current gives 2² = 4× power.
A 12 V motor draws 2 A. What is its power?
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24 W (P = V I = 12 × 2).
A 3 A current flows through a 10 Ω resistor. What power is dissipated?
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90 W (P = I² R = 3² × 10).
What does the power of a circuit device tell you about energy transfer?
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The rate at which energy is transferred — how much energy is transferred per second.
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