📝 OCR A Physics Paper 3 prep guide — last-minute revision, hints & synoptic topics

OCR A Level Physics revision, practice and AI feedback built by teachers

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Moving up a stage? Browse the OCR A & AQA transition guides (GCSE to AS and AS to A Level). Looking for revision routes? Start with OCR A Level Physics revision, A Level Physics MCQ practice, or A Level Physics problem solving practice.

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AS · Internal resistance & terminal pd (Module 4)

A bench power supply has an emf of 12.0 V and an internal resistance of 0.25 Ω. A student increases the current drawn from 2.0 A to 4.0 A by changing the external load. What happens to the terminal potential difference of the supply?

A2 · Electric circuits & sensors (Module 4)

A light sensor is made by placing an LDR in series with a fixed resistor across a 5.0 V supply. The output voltage V_out is taken across the fixed resistor (from the junction to ground). As the room gets brighter, what happens to V_out? Assume ideal wires and that the LDR’s resistance decreases with increasing light.

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