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4.2 Electrical quantities

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Question 57

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

Resistance RRR is given by the equation R=VIR = \frac{V}{I}R=IV​.

The following apparatus is available to the student:

  • ammeter
  • voltmeter
  • low-voltage d.c. power supply
  • metre ruler
  • resistance wire of uniform diameter
  • sliding contacts (crocodile clips)
  • variable resistor
  • switch
  • connecting leads

Plan an experiment to investigate how the resistance of the wire depends on its length. You are not required to carry out this investigation.

You should:

  • draw a diagram of the circuit you would use to determine the resistance of the wire for different lengths
  • explain briefly how you would carry out the investigation, including the measurements you would take
  • state the key variables that you would control
  • draw a suitable table, with column headings, to show how you would display your readings (you are not required to enter any readings in the table).
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Markscheme

4.2 Electrical quantities Questions

  1. IGCSE
  2. /Physics
  3. /4.2 Electrical quantities

452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.

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