Resistance of wire. My results also suggest that the resistance is directly proportional to the length of the wire.

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Ohm's law states the relationship between the current, voltage and resistance,

voltage (V) = current (I) x resistance (R). By using Ohm's law I was able to work out the how the length of a wire affected the resistance. A component will only obey Ohm's law at a constant temperature. This is because a higher temperature causes the atoms in the component to vibrate. This leads to a greater amount of collisions with the electrons and the atoms increasing the resistance. Due to this the wire must be left to cool down between tests.  

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My results show a positive correlation between the length of the wire and the resistance as when the length of the wire increases so does the resistance. This is because when the length of the wire increases there will be more collisions with atoms in the material as the electrons have further to travel. Collisions convert energy from the free electron into heat energy thus increasing the resistance.

My results also suggest that the resistance is directly proportional to the length of the wire. This means that if the length of wire was doubled the resistance would also ...

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