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What Factors Affect the Resistance of a Wire?

Extracts from this document...

Introduction

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WHAT FACTORS AFFECT THE RESISTANCE OF A WIRE?

PLANNING

The experiment I am carrying out is to see what factors affect the resistance of a wire.

Some of the variables that could affect it could be: -

  • The amount of electricity.
  • The type of wire.
  • The thickness of the wire.
  • The length of the wire.
  • The temperature of the wire.
  • The conditions that the wire is in.

After consideration I decided to choose two variables

  • The length of the wire.
  • The type of wire.

I chose two variables because I would get a wider range of results.

To make it a fair test I will try to keep certain conditions and variables the same. I will make sure the amount of electricity is the same, that

...read more.

Middle

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METHOD

I will set up the circuit as shown in the diagram to see if the resistance in a wire changes when certain variables are changed. First I will draw a table to put my results in. I will record the voltage, type of wire and current. Because I am changing the length of the wire I will have to record the results when the wire is set at different lengths. Then by finding the voltage and current I will use the formula      

R = V

        I          to find the resistance.

RESULTS

1st set

TYPE OF WIRE

LENGTH OF WIRE (cm)

VOLTS FROM WIRE

AMPS

RESISTANCE

(Ω)

Nicrome

20

0.09

0.24

0.375

Nicrome

40

0.26

0.23

1.13

Nicrome

60

0.26

0.23

1.13

Nicrome

80

0.34

0.23

1.47

Nicrome

100

0.41

0.23

1.78

TYPE OF WIRE

LENGTH OF WIRE (cm)

VOLTS FROM WIRE

AMPS

RESISTANCE

()

Constantan

20

0.06

0.22

0.27

Constantan

40

0.11

0.22

0.5

Constantan

60

0.17

0.22

0.77

Constantan

80

0.22

0.22

1

Constantan

100

0.27

0.22

1.22

...read more.

Conclusion

100

1.75

2nd set

WIRE

LENGTH (cm)

RESISTANCE (Ω)

Constantan

20

0.27

Constantan

40

0.5

Constantan

60

0.77

Constantan

80

1

Constantan

100

1.22

CONCLUSION

I predicted that the resistance would change when the current was flowing through different lengths of wire. My prediction appears to have been correct, the more wire there was the more resistance the wire had.

I also predicted that the resistance would be different for the two types of wires (constantan and nicrome). Again my prediction appears to have been correct the nicrome wire had more resistance than the constantan.

EVALUATION

The experiment was to find ‘ what factors affect the resistance of a wire’. I feel that I’ve proved that length and type of wire are key factors. I also felt that my method was quite successful because I had no problems with the experiment. I think that my results are quite accurate since I did the experiment twice and took an average. I also did a fair and safe test.

...read more.

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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