My experiment is to find out how the resistance is affected by the length of the piece of wire that is being used throughout this experiment.

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Otegiri Obazeee         10HP        Coursework

                

AIM:

My experiment is to find out how the resistance is affected by the length of the piece of wire that is being used throughout this experiment.

Prediction:  

Resistance increases in a circuit if the length is increased; resistance is proportional to the length.

      Resistance increases with the increasing length because the electrons suffer more collision with atoms in a long wire, than the electrons in a short distance wire circuit would experience. Electrons moving through a short wired circuit only feel resistance for a short period of time because the shorter the wire the less collision the electrons have to be resisted from; the electrons in a longer circuit will feel resistance for a long period of time. This experimentation will be a fair one so the voltage across the wire will be kept the same.

       If the voltage across the wire is kept the same while the length of the wire increases, the current flowing through the circuit decreases. As I have explained above (That the shorter the length of the wire the less resistance there will; the longer the length of the wire the more resistance there will be). The longer the wire in the circuit the more vibrating positive ions. This will slow down the electron flow; there are loads of free electrons, which cancel out the effects happening to the electrons in the current flow throughout the circuit.

       While voltage in the circuit is kept at an invariable rate because the only variable material in our circuit (experimentation) is the length of the wire. If the voltage is kept at a constant level this will cause an effect on the current and the electrons in the wire. This means that there will be less amount of energy obtainable to the electrons to move through each centimetre of the wire. This explanation of the resistance that is seen in the constant level of voltage will suggest that the electrons move much more slowly through the circuit, so fewer electrons will pass the given point in the second.

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     Current is the rate or measurement of the rate of flow charge, which has decreased in speed, therefore, means the current has decreased and the resistance has increased.

     In the experimentation there is another problem that could cause resistance in the wire the problem, which could occur, is the heat. This is because the material of the wire is copper 26 SWG. And copper is known as a good metal because it is a good conductor of heat and electricity. Heat in the experiment that I will be dong will cause friction between the electrons and ...

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