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# Physics Coursework: Factors affecting resistance of a wire. Hypothesis I think that as you increase the length of the wire, you also increase the amount of resistance.

Extracts from this document...

Introduction

Factors Affecting Resistance of a Wire

Introduction

The objective of this investigation is to find out the factors affecting the resistance of a wire in an electrical circuit.

Hypothesis

I think that as you increase the length of the wire, you also increase the amount of resistance. Current is the flow of electrons and the current is dependent on the amount of voltage which is applied. The current has to go through a circuit, which contains resistance so if you increase voltage you also increase the flow of the current.

Middle

6.15

80

2.36

0.32

7.38

90

2.39

0.30

7.97

100

2.45

0.26

9.42

 Length (cm) Voltage (V) Current (A) Resistance (Ω) 30 2.42 0.78 3.10 40 2.44 0.63 4.87 50 2.45 0.55 4.45 60 2.50 0.42 5.95 70 2.53 0.40 6.33 80 2.56 0.32 8.00 90 2.57 0.30 8.56 100 2.60 0.29 8.97
 Length (cm) Voltage (V)

Conclusion

ss="c28" colspan="1" rowspan="1">

70

2.50

0.38

6.58

80

2.51

0.31

8.10

90

2.57

0.29

8.86

100

2.63

0.27

9.74

Average

 Length (cm) R1 (Ω) R2 (Ω) R3 (Ω) R Ave (Ω) 30 2.74 3.10 3.40 3.08 40 3.54 4.87 3.85 4.09 50 4.29 4.45 4.78 4.51 60 5.47 5.95 5.74 5.72 70 6.15 6.33 6.58 6.35 80 7.38 8.00 8.10 7.82 90 7.97 8.56 8.86 8.46 100 9.42 8.97 9.74 9.37

Conclusion

My hypothesis was correct. There is a connection between resistance and wire length, as the length of the wire increases the resistance increases. Ohm's law states that the current flowing through the circuit is directly proportional to the voltage applied. (If you double one, you double the other).

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