To investigate the variation of the resistance of a metallic conductor with temperature

Apparatus

Coil of wire (see note), glycerol, beaker, heat source, thermometer, ohmmeter, boiling tube.

Procedure

• Place the coil of wire in the boiling tube with the glycerol and place it in a beaker of water.
• Arrange the beaker over the heat source.
• Connect the ohmmeter to the coil of wire.
• Use the thermometer to note the temperature of the glycerol, which is also the temperature of the coil.
• Record the resistance of the coil of wire using the ohmmeter.
• Heat the beaker.
• For each 10°C rise in temperature record the resistance and temperature using the ohmmeter and the thermometer.
• Plot a graph of resistance against temperature.

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To investigate the variation of the resistance of a metallic conductor with temperature

Results

R/Ω
θ/°C