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Investigating (one of) the factors that affect resistance.

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  • Essay length: 1295 words
  • Submitted: 25/11/2003
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GCSE Electricity and Magnetism

The first 200 words of this essay...

Investigating (one of) the factors that affect resistance

I am going to investigate how much changing the length of a wire affects the resistance in a circuit. I am going to test this by changing the length of a wire in a circuit, in steps of 10cm. I will record the readings of the volts and currents in a table. By recording these readings I am then able to work out the resistance. By using the formula. V

R =

I

Safety precautions

In order to avoid the dangers involved I will have to take safety precautions. In case the wire gets too hot I will place a heatproof mat under the wire during the experiment.

Prediction

Using my scientific knowledge on resistance I can make a prediction. I predict that the wires which measure 40cm and 50cm will have a low resistance respectively, because there is a shorter length for the current to travel. Meaning less collisions between the atoms of the wire and the electrons of the current. Also the electrons do not have to squeeze together for a long amount of time, because these lengths of

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