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The Effect of Length on the Resistance of the Wire

            Aim: To find out the effect on resistance, when the length of wire is changed.
            
             In my experiment I will firstly get 3 100 cm wires made of constantan all of different thickness', one of .28 one of .40 and one of .56cm. We will set up the experiment like this diagram shows;.
             An Ammeter will be connected in series and a voltmeter in parallel across the wire as shown above).
             We will start by attaching the smaller wire to the circuit. We will turn the power on and see what voltage and current is read on each of the meters. The power will only be left on for minimal time, (heat makes Ohms law false) so we will make sure the power is only left on for enough time to read the meters (a few seconds).
             To hold the wire onto the circuit crocodile clips will be used at each end of the wire only one crocodile clip will be moved throughout the experiment, to change the distance being used (10cm, 20cm, 30cm up to 100cm).
             After we have tested each length on one wire we will switch the wire for the next highest thickness and test that wire, the same will be done again for the next wire, until all the lengths for each wire have been tested and recorded. At this point I will compare these results to my predicted ones (prediction). And see if my predictions were right or wrong.
             Background knowledge.
             Voltage is the force that pushes electrons around the circuit.
             Current is the flow of electrons.
             Resistance is the force objecting the flow of electrons.
             They are linked easily in Ohms law V=I x R (voltage = current multiplied by resistance). We must remember at all times however that this equation is only valid of the temperature of the room is the same (normal room temperature) for all the experiments.
             Electron flow theory tells us that current flows (in reality) from + to -. .
             If you increase the length of a wire then the resistance will increase.
             If you increase the thickness of a wire then the resistance will decrease.
             To get the resistance without using Ohm's law you can use the following equation;.


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