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To find out how the length of a piece of nicrome wire Can affect the resistance of electricity in a current.

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Introduction

What Affects Electricity in A Wire Aim: To find out how the length of a piece of nicrome wire Can affect the resistance of electricity in a current. Plan: I will begin my experiment by getting together all of the Equipment I need. This is all shown below. - A voltmeter (measures the potential difference) - An ammeter (measures the current) - A power pack - Wires - Crocodile clips - A metre ruler - A 0.37 mm diameter,75cm long nicrome wire I will put all of these into a circuit set out like the diagram below: I will first of all make sure that The length of wire is 75cm. Then I Will put 2 volts through the circuit And take down the readings from Both the ammeter and the volt - Meter and put them into a table. ...read more.

Middle

I will use the same wires, power pack, ammeter and voltmeter each time. To keep this experiment safe I will make sure that the voltage is not to high because this may cause the wire to melt. I will make sure I do not touch the wire because it can get hot and may burn but I am to use the crocodile clips only to change the length. Also to be careful when straightening the wire because it is very thin and may cut into the skin. Prediction: I predict that as the length of the wire is increased the resistance will increase and as the length is decreased the resistance will do the same. I believe this because I know that if the electrons in a current have further to travel then the resistance will increase. ...read more.

Conclusion

Evaluation: The procedure , I believe was reliable, but I could have improved it in many ways to get more accurate results, such as; doing the experiments more than 3 times to get a more accurate average, using a measuring device that was more accurate and using a rheostat instead of a piece of nicrome wire. There were limitations in the experiment ie. The crocodile clips are wide and therefore are not as accurate, also we set up the wire using limited equipment so it could never have been perfectly accurate. In the first set of results there were some readings that did not fit the pattern, this may have been because I did not take enough care over my measuring. This occurred again in the second set of results but not in the third, this may have been because the wire was not held in position properly and so was re-straightened before the last set were taken. ...read more.

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