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Does the length of a wire effect the Resistance?

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Introduction

Science Coursework

Lauren Weston

Mr Carville

Science Coursework

Does the length of a wire effect the Resistance?

I am doing an experiment to test whether the length of a wire affects the Resistance. Resistance is anything in the circuit which slows the flow down. If you increase the resistance less current will flow. My aim is to find out whether resistance is affected when the length of the wire differs.  Below is an empty graph of the data I am going to collect. Except I am only going up to 1m, not 1.2m.

Background Knowledge

Resistance is determined by how good or bad a conductor a material is. Electrons move more easily through some conductors when a potential difference is applied. A good conductor has a low resistance while a poor conductor has a high resistance. The structure of a metal affects the resistance because they have a sea of electrons which allows electrons to pass threw easily, decreasing the resistance.

I already know that there are some factors which affect the Resistance in a wire, these include:

• Temperature
• Length
• Width

The material the wires made of would affect the resistance in a wire because as I’ve already mentioned, Electrons move more easily through good conductors making the resistance lower.

Middle

Ammeter –                         to read the current

Voltmeter –                 To read the voltage

Connecting wires –         connecting my circuit together

Metre ruler -                 Measure distances of wire

Wire -                         To experiment with

Below is a diagram of what my circuit will look like:

To start my experiment I will get all the equipment together and create a simple circuit including the power pack, ammeter and voltmeter. I will then link these up using the wires and crocodile clips. Once I have it set up and I have a table to write the results in I am ready to go.  I will turn on the power making sure it’s set to 5 volts. When I turn on the power I have to make sure that I only leave it on for a couple of seconds otherwise the heat in the wire will rise, which will make it an unfair test plus Ohms law will not work – it needs constant room temperature, as already mentioned.  I am going to have to read the measurements of the meters very quickly in order to avoid this problem. I will attach the crocodile clips onto the end of each wire so I can clip them on to the wire.

Conclusion

If i had time i would have liked to extend my investigation. I would do this by using the width of the wire as a variable. I would keep to testing three times though because that worked well, and accurate results were gained.  After that i would go on to test how reistance is affected by my other theories on different variables. I have enjoyed doing this investigation and have learnt a lot and have proved my prediction.

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