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3.2 Simple circuits

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Question 18
F

A student investigates how the resistance of a wire depends on its length.

The wire gets hot during the investigation.

Which change would improve the results?

[1]
A

Use a larger potential difference so that the meter readings are larger

B

Repeat each reading three times and calculate a mean resistance value

C

Use a much longer wire so that the current in the circuit is larger

D

Switch off the circuit between readings so that the wire stays cool

Markscheme

3.2 Simple circuits Questions

  1. GCSE
  2. /Physics
  3. /3.2 Simple circuits

42 exam-style questions on OCR GCSE Physics 3.2 Simple circuits, covering 3.2.1 Series and parallel circuits, 3.2.2 Circuit symbols and circuit diagrams, 3.2.3 Current, potential difference and resistance, 3.2.4 Ohm's law, 3.2.5 Ohmic and non-ohmic resistors, 3.2.6 Designing circuits to investigate resistance, 3.2.7 Linear and non-linear circuit components, 3.2.8 Current-potential difference graphs for components, 3.2.9 Resistance in series and parallel, 3.2.10 Series and parallel circuit problems, 3.2.11 Circuits for measurement and testing, 3.2.12 Power transfer in circuit devices, and 3.2.13 Energy and power in resistor circuits. Each one has a worked solution and a mark scheme showing where the marks go.

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