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In this experiment I will be investigating the factors in which affect the resistance of a wire.

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Introduction

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        In this experiment I will be investigating the factors in which affect the resistance of a wire.

The factors that I could change

        The factors that I could change could be: -

        The length of the wire as this determines how far the electrons have to go in order to hit one another.

        The time the circuit is left on for because the wire can get hot and the results could fluctuate.

        Whether or not the wire is coated with plastic or not.

        The amount of voltage which is inputted into the circuit. If this changed each time the results would change as more or less voltage is put in. If you increase the VOLTAGE – then more CURRENT will flow. If you increase the RESISTANCE – then less current will flow.        

The material used may make a difference, as there are different metals (conductors) in which I could use and different Non-metals (Insulators).

I will measure/observe . . .

        Current which are measured in amps. To measure this I will use an ammeter.

        Voltage which is measured in Volts. To measure this I will use a voltmeter.

        Resistance. To find out resistance I will use the simple equation: -

                Resistance = Voltage image00.png

                                                  Current

I will change . . .

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Middle

0.93

0.82

15

0.9

1.90

2.11

20

0.66

1.80

2.73

25

0.56

1.16

2.07

30

0.20

0.48

2.40

35

0.03

0.07

2.33

40

0.01

0.06

6.00

2nd set of readings

Length of wire (CM)

Current in Amps

Voltage in Volts

Resistance (ohms)

5

1.84

0.74

0.40

10

1.14

0.96

0.84

15

0.90

1.90

2.11

20

0.69

1.83

2.65

25

0.51

1.16

2.26

30

0.21

0.45

2.14

35

0.03

0.13

4.33

40

0.01

0.05

5.00

Averages

Length of Wire (CM)

1st set of results (Resistance)

2nd

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Conclusion

My investigation was fair throughout because I stuck with the rules I had set, made sure it was perfect and that I did the timing sufficiently in the whole experiment.

         I think the amount of data that I have collected is sufficient enough because it proves my theory and complies with the title. But I could of explored into another factor which could of made the results turn and see which way the resistance would turn from high to low or low to high!

        If I was to change anything it would defiantly be the lengths which will be set apart more and longer to give a varied answer.

If I obtained more evidence it would defiantly be more to the part of exploring more factors so that I could see which factors affect the resistance as said in the title.

This extra evidence would make me certain of what factors change the resistance so that the answers would tell me if certain things make resistance go up or down.


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This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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