09. Variation of resistance with temperature

  • 00:31 The ohmmeter must in series with the coil. Why is this?
  • 01:13 The temperature must be stable before heating is begun. Why?
  • 01:42 Which variable is plotted on each axis? Why does the graph NOT pass through the origin?
  • bunsen burner; tripod, gauze and stand

  • 250 ml beaker of water or water bath with heating element

  • ice

  • thermometer 0 – 1000C

  • multimeter set on ohm range to measure resistance

  • copper coil

  • stirrer

Hazard Risk Control measure

Hot water

Hot water can cause severe burns

Students should wear eye protection and should handle apparatus with tongs.