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4.3 Electric circuits

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Question 1

A student investigates the change in resistance of a thermistor when its temperature is increased.

The following apparatus is available:

  • a power supply
  • a thermistor
  • an ammeter
  • a voltmeter
  • a thermometer
  • a beaker containing water and a heat source
  • connecting wires

Other apparatus normally found in a school laboratory is also available.

Plan an experiment to investigate the change in resistance of the thermistor when its temperature is increased.

Resistance RRR is given by the equation R=VIR = \frac{V}{I}R=IV​, where VVV is the potential difference (p.d.) across the thermistor and III is the current in the thermistor.

You should:

  • draw a diagram of the circuit and setup used
  • explain briefly how to do the investigation, including how to raise and measure the temperature
  • draw a table, or tables, with column headings, to show how to display your readings (you are not required to enter any readings in the table)
  • explain how to use your readings to reach a conclusion.
[10]
Markscheme

4.3 Electric circuits Questions

  1. IGCSE
  2. /Physics
  3. /4.3 Electric circuits

136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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