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# Resistance of a wire.

Extracts from this document...

Introduction

Resistance of a wire.

## Background Information

George Ohm discovered that a circuit sometimes resists the flow of electricity.  He called this resistance.  The rule that George Ohm came up with for working out the resistance of a wire is as followed:

V/I = R

V – Volts

I – Current

R – Resistance

This is known as Ohms Law

## Prediction

The purpose of this experiment is to investigate the factors that affect the resistance of a wire. The hypothesis that I intent to prove or disprove is ‘resistance will increase as the length of the wire increases, and resistance will decrease as the wire gets thicker. The experiment to come to this conclusion will be conducted as follows: firstly we attached three wires to nails that were held in place by a wooden board. The wires were attached o the nails by crocodile clips. The wires were all of different thickness, i.e. thick thin and medium circumferences.

Middle

60

0.78

0.90

1.21

0.77

2.30

0.72

1.11

70

0.82

0.94

1.37

0.87

2.69

0.84

1.26

80

0.87

1.00

1.58

1.00

3.06

0.95

1.41

90

0.98

1.13

0.74

1.10

3.42

1.07

1.52

100

1.07

1.23

2.00

1.27

3.78

1.17

1.75

 Medium wire Low Current Medium Current High Current Length (cm) Volts (V) Ohms (R) Volts (V) Ohms (R) Volts (V)

Conclusion

td class="c12" colspan="1" rowspan="1">

5.53

5.45

90

3.63

5.95

5.20

6.05

9.73

6.24

6.09

100

4.21

6.90

5.70

6.63

10.84

6.95

6.87

 Thin Wire Low Current Medium Current High Current Length (cm) Volts (V) Ohms (R) Volts (V) Ohms (R) Volts (V) Ohms (R) Average Resistance 10 0.469 1.07 0.77 1.75 0.97 2.20 1.19 20 1.18 2.68 1.6 3.64 2.18 4.95 2.71 30 1.98 4.5 2.5 5.68 3.23 7.34 4.21 40 2.60 6.05 3.32 7.55 4.4 10.00 5.66 50 3.47 7.89 4.29 9.75 5.5 12.5 7.23 60 4.15 9.34 5.08 11.55 6.5 14.77 8.58 70 4.39 9.98 5.84 13.27 7.8 17.72 9.83 80 4.92 11.18 6.8 15.45 8.92 20.27 11.26 90 5.31 12.07 7.68 17.45 9.99 22.70 12.53 100 6.24 14.18 8.86 20.14 11.50 26.32 14.55

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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