📝 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

PhysicsUK helps A Level Physics pupils revise OCR A topics, practise exam-style questions, receive instant feedback, and strengthen written explanations.

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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 · Electricity (M4)

A student powers one small torch bulb from a 6 V battery. They then add a second identical bulb in parallel with the first using short, negligible-resistance wires. Assume the bulbs behave like simple resistors over this range. Which statement must be true when the second bulb is connected?

A2 · High level GCSE electricity, Potential dividers and sensor circuits, Meter loading (qualitative and simple quantitative)

A student tests a light sensor circuit powered by 5.0 V: a 10 kΩ fixed resistor is in series with an LDR to 0 V, and a voltmeter with 20 kΩ input resistance is connected across the LDR to read V_out at the junction. The LDR is 10 kΩ in the dark and 2.0 kΩ in bright light. Which statement must be true about the meter reading as the light increases? Estimate numerically.

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