Main Investigation - Resistance of a wire

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Dean Greer

Science Coursework

10th May 05

Main Investigation – Resistance of a wire

Aim:

The main point of this experiment is to find out how resistance is affected by the length of wire.

Apparatus:

Here is a list of apparatus that I will need:

  • Power Supply
  • Wire on a Board
  • Ammeter
  • Voltmeter
  • Wires
  • Crocodile Clips

Here is a labelled diagram of the apparatus that I will use:

Method:

Here is a list of variables I have identified:

  • Length of wire
  • Temperature of wire
  • Voltage from power supply
  • Thickness of wire
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The variable I am choosing to alter is the length of wire because that is what the whole experiment is about.

I will improve what we did in the prelim by controlling all the variables i.e. I will keep the power supply at one amp, I will allow the wire to cool and I will use the same thickness of wire.

Step by Step Plan:

  1. Set up the equipment as shown in the diagram.
  2. Set the crocodile clip at a certain length, start at 10 cm.
  3. Turn on the power supply and set it at one ...

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