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An experiment to find how the length of a wire affects the resistance.

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Introduction

An experiment to find how the length of a wire affects the resistance

Aim

The aim for this experiment is to find out how the length of a wire affects its resistance and voltage.

Procedure

I intend to investigate the relationship between the length of wire and its electrical resistance.  I shall vary the length of the wire but keep such variables as the temperature and the diameter constant.  I will make sure the voltage and the current are consistent before working out the resistance.

Method

I will set up a circuit as the diagram that is shown below. I will connect the positive terminals of the two cells up to the ammeter that will monitor the current in the wire. After this, I will connect the circuit to a variable length of constantan wire. I will connect a voltmeter parallel to this length of wire. This will measure the voltage across it. I will use a spade connector to alter the length of constantan that will be used for each individual experiment. This spade connector will be connected to a variable resistor before another connection links the variable resistor to the negative terminal of the cells. I will measure out 10cm from the connection of the normal constantan wire and hold the spade connector there.

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Middle

0.6

3

0.59

2.95

40

0.74

3.7

0.73

3.65

0.73

3.65

50

0.86

4.3

0.88

4.4

0.94

4.7

60

1.1

5.5

1.06

5.3

1.1

5.5

70

1.23

6.15

1.22

6.1

1.29

6.45

80

1.37

6.85

1.47

7.35

1.46

7.3

90

1.59

7.95

1.58

7.9

1.56

7.8

100

1.8

9

1.73

8.65

1.8

9

Experiment 4

Experiment 5

Length of constantan wire (cm)

Voltage (v)

Resistance (ohms)

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Conclusion

Improvements

If I were to repeat the experiment, I could make several improvements to improve the level of such factors as accuracy and safety.  For example, I could ensure that the connections were securely fastened or even bolted to increase both safety and accuracy.  I could also get as many opinions as possible or get some sort of machine to measure the length of the constantan wire. I could increase the number of times I carry out each of the scenarios.  This would improve accuracy even more.  I would check the wire and ensure that there were no bends or kinks in it because this would affect the flow of electrons through it.

Further work

If I were ever to do this experiment again, I could consider investigating another of the key factors involved with this investigation. For example, I could change the type of wire, the temperature of the wire, the diameter/width of the wire. I could also choose to vary the current or the voltage and, therefore change the dependent variable as well.

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