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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.

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)

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.

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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