Investigating the resistance of a wire.

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tInvestigating the resistance of a wire

Aim:

For this investigation I have decided to investigate how the variables length affect the resistance of a nickel chrome wire. We could have investigated the variable temperature but temperature is hard to control or vary and if the wire became to hot that would be a safety hazard.

Equipment:

The equipment I will require to undergo the experiment are shown below:

  • A battery pack (0-12V)
  • A volt metre (0-15)
  • An amp metre (0-5)
  • 5 connecting wires
  • 2 crocodile clips
  • Two 60 cm pieces of Nickel Chrome wire
  • A tub of water.

Method:

To get my results I will need to follow the method below:

  1. Set up the circuit shown below:

To investigate the variable length follow this method:

  1. Place one crocodile clip at one end of the wire and the next 10cm along
  2. Place it in a tub of water.
  3. Turn the battery pack on.
  4. Record the readings from the Amp metre and the volt metre.
  5. Turn the battery pack off.
  6. Repeat another two times and take an average.
  7. Move the crocodile clip another 5 cm along.
  8. Repeat steps 2-6.
  9. Move the crocodile clip another 5 cm along the wire.
  10. Repeat steps 2-6.
  11. Move the crocodile clip another 5 cm along the wire.
  12. Repeat 2-6.
  13. Move the crocodile clip another 5 cm along the wire.
  14. Repeat steps 2-6.
  15. Calculate the resistance for each length.
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To investigate the variable length follow this method:

1.Place one crocodile clip at one end and fold the wire 20 cm along and clip the next crocodile clip.(SGW – 28)

  1. Place in tub of water.
  2. Turn the battery pack. (4 V)
  3. Record the readings from the Amp metre and the Volt metre.
  4. Turn the battery pack off.
  5. Repeat another two times and take an average.
  6. Fold the wire another 20 cm and clip with crocodile clip.
  7. Repeat steps 2-6.
  8. Fold the wire another 20 cm and clip with crocodile clip.

10.Repeat steps 2-6.

11.Fold ...

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