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Resistance of a wire

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Resistance of a Wire

The aim of my investigation is to see if the electrical resistance of a wire changes with the length of the wire.

Electrical resistance is a measure of the degree to which an object opposes the passage of an electric current.(Wikipedia)

I will decrease the length of the wire and measure the voltage and current. Then ,by using the following formula, will measure the resistance of each length.

RESISTANCE= Voltage        (R=V)

                          Current               I

Resistance is measured in Ohms(Ω)

Voltage is measured in Volts (V)

Current is measured in Amps (A)

To make my experiment a fair test I will do the following things:


wire material must stay the same or the test is unfair.

 Voltage, a different voltage could change the amount of the resistance.

Temperature is important and must stay the same because the if it gets too hot the electrons heat up and resistance is increased.

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1x Ammeter

1x voltmeter

1x 1 metre of Nichrome Wire

1x 1metre Ruler

5x connecting leads

4x crocodile


I will measure voltage and current at 5cm intervals, then using the results calculate the resistance for each 5cm.

For example my wire length will decrease every 5 cm(100,95,90,85.….)

This will give me 20 more accurate results instead of just 10.


I predict that the longer the piece of wire, the more resistance. I predict this because the more wire there is the more fixed atoms there will be. Which means more obstacles for the electrons to get past, and should therefore make more resistance.

My preliminary experiment

For my preliminary experiment I will test 50 cm of Copper and Nichrome wire to find out which wire is my suitable for my investigation.

After doing my preliminary experiment I have decided to use the Nichrome wire because the copper wire heats up to easily, the heat then affects the resistance and makes the results unfair.

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I didn’t have any major problems during the experiment.

Although I did not get any anomalous results if I had a few of the factors that would have affected the results would have been faulty equipment taking inaccurate readings or the wire could have heated up and caused the resistance to increase unfairly.

If I was to further my investigation I would experiment with a few differences. I would have liked to use three different types of wire to see if the type of wire affects resistance and I would also change the thickness of the wire.

All the results would be collected in a table and then drawn into a scatter diagram and compared with each other.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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