AQA GCSE Physics revision

Can you spot the controlled variable in this GCSE Physics question? with AI Marker.

Use this AQA GCSE Physics revision page to focus on a Foundation question from Unit 2 Electricity about direct and alternating potential difference. You can check what the question is really testing, see the answer and GCSE mark scheme guidance, and practise with AI Marker’s 75,000+ GCSE questions, instant AI marking, and Mentor — an AI Tutor built for GCSE revision. It’s a clear way to build confidence with GCSE Physics questions and answers, GCSE exam practice, and structured GCSE revision questions.

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AQA • Physics • Unit 2 Electricity

State one variable that should be controlled in this investigation.

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AQAGCSEPhysicsFoundation1 mark
GCSE revision question
Question context

A student plans to investigate the difference between direct current (DC) and alternating current (AC) voltage using a circuit with a power supply, voltmeter, and a resistor. The student considers variables such as voltage type, resistance, and measurement accuracy.

State one variable that should be controlled in this investigation.

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Answer and mark-scheme guidance

MP1: resistance

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Can you secure the mark by naming the exact controlled variable?

This question is testing whether you can identify one variable that should be kept the same in the investigation. For this mark, the wording that earns credit is resistance.

Quick takeaway: Controlled variable to state: resistance.

Direct and alternating potential difference GCSE questions

For this piece of Unit 2 Electricity GCSE revision, the key skill is spotting the variable that must be controlled in an investigation question. In this AQA GCSE Physics question, the mark scheme allows resistance. Use pages like this for GCSE Physics exam questions, GCSE Physics questions and answers, and GCSE mark scheme guidance, then practise more with 75,000+ GCSE questions, instant AI marking, and Mentor — an AI Tutor for GCSE revision.

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