AQA · Physics · 8463
GCSE Physics: Resistors
Electricity · AQA GCSE Physics (8463), specification point 4.2.1.4. Cards are generated from the exam board's own specification for "Resistors", and every card links back to the page it came from. Specification © AQA — used with attribution.
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How is current related to potential difference for an ohmic conductor at constant temperature?
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Current is directly proportional to potential difference, so the resistance stays constant as the current changes.
For an ohmic conductor, current is proportional to potential difference only if the ? is kept constant.
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temperature
What happens to the resistance of a filament lamp as the filament gets hotter?
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It increases.
In how many directions does current flow through a diode?
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One direction only — the diode has a very high resistance in the reverse direction.
A diode has a very ? resistance in the reverse direction.
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high
What happens to the resistance of a thermistor as temperature increases?
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It decreases.
Give one application of a thermistor in a circuit.
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A thermostat (temperature-controlled switching, e.g. in a heating system).
What happens to the resistance of an LDR as light intensity increases?
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It decreases.
Give one application of an LDR in a circuit.
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Switching lights on automatically when it gets dark.
Which two quantities are measured to find the resistance of a component?
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The current through the component (ammeter in series) and the potential difference across it (voltmeter in parallel); R = V / I.
What does a straight-line I–V graph through the origin tell you about a circuit element?
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It is linear (ohmic): its resistance is constant.
Which three components are investigated in the GCSE I–V characteristics required practical?
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A filament lamp, a diode, and a resistor at constant temperature.
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