Investigate how the length of a wire affects the current and resistance of a wire.

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Current and Resistance

Aim:

Investigate how the length of a wire affects the current and resistance of a wire.

Prediction and Hypothesis:

I think as you increase the length of the Constatan wire, you also increase the amount of resistance. The current is the flow of electrons; the current is dependent on the amount of voltage, which is applied. Voltage is the push given to the current. The current has to go through a circuit, which contains resistance so if you increase that push you also increase the flow of the current. All materials have a slight resistance to electricity factors affecting the resistance are: Length, Voltage & Temperature and Surface Area

Length

The diagram shows the happenings of a wire

the blue dots represent some of the negative

electrons which leads to a lower voltage output,

when the length is increased.
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Voltage & Temperature

Temperature has an affect on the experiment as the voltage has control over the temperature. The more the temperature increases the more the particles vibrate leading to a reduction in output voltage although not by a huge amount this does have an affect.

Density

Density has a large affect on the amount of resistance. The resistance depends upon the amount of denseness e.g. a large surface area has less resistance because a small area has tightly packed atoms which in turn rebound many of these electrons.

Apparatus:

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