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10.2 Resistance

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Question 5

A frost-protection heater contains two sections of resistance wire joined end to end, with no branches. When connected to a 12 V supply, the potential difference across the longer section is 7.5 V. The supply is then set to 20 V. The resistance of each section remains constant.

What is the increase in potential difference across the shorter section?

[1]
A

3.0 V3.0\ \mathrm{V}3.0 V

B

7.5 V7.5\ \mathrm{V}7.5 V

C

8.0 V8.0\ \mathrm{V}8.0 V

D

4.5 V4.5\ \mathrm{V}4.5 V

Markscheme

10.2 Resistance Questions

  1. GCSE
  2. /Physics
  3. /10.2 Resistance

81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.

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