How does the Length of Pencil Lead affect Its Resistance

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              How does the Length of Pencil Lead

                         affect Its Resistance

Planning:

Aim: The aim of this piece of course work is to find out how does the resistance of a pencil lead changes as I increase its length. And to find out what is the relationship between the length of a pencil lead and its resistance.  

Safety: Safety is a very important thing to consider as we doing a scientific experiment, so is this experiment. For make sure there will not be any accident as I doing this experiment, I will do the following things.

1, I will make sure I had set up the right electrical circuit before I let the electricity run through the circuit, to prevent the short circuit.

2, I will add a switch in the circuit, so that will prevent the lead get too hot to handle and to prevent the battery wasting.

3, I will be careful when I am holding the pencil lead because it would burning your skin if it got to hot.

Fair Test: I will try to make this experiment as fair as I can, therefore I would be able to get some reliable results. To make this experiment be a fair experiment, I will do the following things.

1, I will put all my experimental equipments in the box, so that I can use the same equipments every time, such as battery packs and pencil lead.

2, I will do the same thing three times, and I will make sure that I finish every time I started because it would be some physical changing to the equipments if I left them there.

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Apparatus: For this experiment, I need a battery pack (4 batteries), a switch, and a set of wires, an ammeter, a voltmeter, 2 crocodile clips and a pencil lead.

Method: I have chosen this method for this experiment because I think it is a fair and safe way to carry out the experiment.

   Firstly, the circuit will be set up in a right way as the graph (G1) was shown below, and I will check it before I start the experiment. I will make sure set the ammeter in a series circuit and voltmeter in a parallel ...

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