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During my investigation there will be several factors that I will need to control or keep constant, to ensure that my results are as reliable as possible. Two of these factors are the current and voltage output. These two factors contribute to the amount of resistance in the circuit, meaning that I will have to keep both at a constant value, to be able to observe and record the effect of the length of wire on the resistance in the circuit. By using a resistor and an ammeter in my circuit, I will be able to dictate the rate of the current flowing through it. By using the same voltage batteries every time in my investigation, I will also be able to ensure that the voltage in the circuit is the same each time. I will also ensure that the external temperature throughout my investigation remains at an approximate constant. This...

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