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AS Physics Coursework - Resistivity in a wire. watch

    • Thread Starter

    We got just given our coursework in college and I am utterly clueless on what to do for this! I'm supposed to be investigating how changing the length of the wire in a circuit affects its resistance and then calculating the constant resistivity of that wire afterwards. Can anyone help me out here?

    How do you set up the experiment? What do I do? How do I improve my preliminary experiment? How do I find out my uncertainties?

    If anyone has done this experiment/coursework or something similar before and could help me out it would be much appreciated!
    • Thread Starter

    Any help at all?
    • Thread Starter

    Can any one help with this?

    resistivity is a property of the material, resistance occurs in a circuit- I'm assuming you'll probably be giving an ammeter and a voltmeter, as well as different lengths of wire- you'll probably just have to set up a series circuit- with a length of wire inserted as a component- you should include the ammeter in this, put the voltmeter in parallel to the wire. Record the voltage and current and use the equation v=ir in the format r=v/i to work out resistance- seen as there isn't a resistor in the circuit, the resistance must come from the wire and is actually resistivity. Then you'll most likely draw a graph and have to explain what you see on it (eg. the pattern etc.) if it's a qualatitive paper it will be about how you do the experiment, if it's quantative concentrate on the maths and the units and if it's evaluative- look for the problems in the way the experiment was carried out.
    good luck
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