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To investigate the factors that affects the resistance of metal wires.

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Resistance of a wire


To investigate the factors that affects the resistance of metal wires.


Resistance is a force that opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long. E.g. The filament across an electric light bulb. A resistor has the resistance of one ohm if a voltage of one volt is required to push a current of one amp through it. The resistance is measured in ohms (   ). Resistances is important in an electric circuit, as,

Preliminary Experiment

  In this experiment, I am working out whether length

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How it is controlled.

The length of the wire

This will be the only thing in the experiment I will change. I will measure it on a metre ruler.

The diameter of wire

I will use the same piece of wire the whole way through the experiment so it will stay the same.

The current

The current needs to stay the throughout the experiment. I will measure this with an ammeter and I will also use a resistor to make sure the amp can stay as close to each other as possible.

The heat of the wire

It will be hard to keep this the same but I

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The length of the wire will make a difference to the resistance. This is because when you have a long wire, the electrons have to squeeze together for longer to be able to pass through the wire than they do in order to be able to pass through a short wire. I predict that the longer the wire, the greater the resistance. For example, if I had a 30 cm wire and a 60 cm wire, the 60 cm wire would have a resistance twice that of the 30 cm wire. The more the electrons bump together, the higher the resistance

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