AQA · Physics · 8463
GCSE Physics: Current, resistance and potential difference
Electricity · AQA GCSE Physics (8463), specification point 4.2.1.3. Cards are generated from the exam board's own specification for "Current, resistance and potential difference", 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 potential difference, current and resistance?
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V = I R (potential difference = current × resistance).
Potential difference = current × ?.
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resistance
For a fixed potential difference, how does increasing resistance affect current?
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The current decreases — greater resistance means a smaller current for a given pd (I = V/R).
Which two quantities determine the current through a component?
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The resistance of the component and the potential difference across it.
What is the SI unit of potential difference?
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The volt (V).
What is the SI unit of current?
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The ampere (A), often shortened to amp.
What is the SI unit of resistance?
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The ohm (Ω).
Which symbol represents current in the equation V = IR?
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I.
What is another acceptable name for potential difference?
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Voltage.
How do you rearrange V = IR to find resistance?
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R = V / I (resistance = potential difference ÷ current).
What must be kept constant when investigating how wire length affects resistance?
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The temperature of the wire.
Which two resistor arrangements are compared in the resistance required practical?
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Resistors in series and resistors in parallel.
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