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10.2 Resistance

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Question 9

A uniform wire has resistance RRR, length LLL, resistivity ρ\rhoρ, mass mmm, and density ddd. Which of the following equations correctly expresses the resistance of the wire?

A
R=ρmL2d R = \frac{\rho m}{L^2 d} R=L2dρm​
B
R=ρL2dm R = \frac{\rho L^2 d}{m} R=mρL2d​
C
R=ρL2md R = \frac{\rho L^2 m}{d} R=dρL2m​
D
R=ρdmL2 R = \frac{\rho d}{m L^2} R=mL2ρd​
Markscheme

10.2 Resistance Questions

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

59 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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