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resistance of a wire

Extracts from this document...

Introduction

Resistance of a wire

I am going to investigate how the length of the wire affects its resistance. The wire I will use in Constantine 32 SWG.

Resistance resists the flow of current. This happens because moving electrons bump into stationary atoms in the wire and is calculated using the equation R=V/I where R= resistance, V= voltage and I = current.

Electric current is the flow of charge around a circuit and measured in amps. The current depends on voltage and resistance. A current will only flow if there is a voltage, the driving force across that component.

Resistance can be altered by

  • Changing the length of the wire – increasing the length of the wire will increase its resistance because there are more stationary atoms in the wire for the moving electrons to bump into.
  • Changing the thickness of the wire - – increasing the thickness of the wire will increase its resistance because there are more stationary atoms in the wire for the moving electrons to bump into.
  • Changing the material of the wire – different materials have a different number of stationary atoms in the wire.
...read more.

Middle

22.88

Attempt 2

Length (cm)

Voltage (v)

Current (amps)

Resistance (Ω)

0

0

0

0

10

1.62

0.65

2.49

20

1.70

0.33

5.15

30

1.73

0.24

7.21

40

1.50

0.17

2.94

50

1.79

0.14

12.59

60

1.81

0.12

15.08

70

1.82

0.11

16.55

80

1.83

0.10

13.80

90

1.82

0.09

20.22

100

1.83

0.08

22.88

Attempt 3

Length (cm)

...read more.

Conclusion

I would have liked to look at the thickness of the wire and investigate the best thickness to use.

I think my results were accurate as they were on or very near to the line of best fit. The result which was slightly abnormal was at 90cms. The point is a little off the line. This may have been caused by an increase in temperature of the wire.

...read more.

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