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# Investigating weather the length of a wire affects the resistance.

Extracts from this document...

Introduction

Doha Salameh        Physics coursework

11JCU               Mr Harris

GCSE Science Coursework Investigation

## Electricity

Investigating the resistance of a wire

## I am investigating weather the length of a wire affects the resistance.

The main factors that affect the resistance of a wire are length, thickness, material of wire, voltage and temperature. Resistance occurs in all parts of the circuit, that is when particles collide with something opposing it therefore this will slow down the flow of electric current. George Ohm, a German schoolmaster stated that the relationship between the length of the wire and the resistance should be directly proportional, which means that if the length increases then the resistance must also increase. To calculate the resistance of a wire you divide the current into the voltage. R (ohms) = V/A.

Planning

I am going to be doing two experiments for this investigation. The first will be just to test if the circuit works and the second experiment is the main investigation, which is to find out weather the length of a wire affects the resistance. Circuit 1 is the circuit that I will be applying for the investigation. Circuit 2 is the trial experiment, to test if the circuit works.

Diagrams

### Equipment

• Meter Ruler
• Wire (100cm)
• Power Pack
• Ammeter
• Volt Meter
• 2 Crocodile Clips

### Method

Middle

0.18

0.18

60

0.21

0.22

0.21

0.21

50

0.22

0.23

0.22

0.22

40

0.23

0.24

0.23

0.23

30

0.25

0.25

0.24

0.25

20

0.26

0.25

0.25

0.25

10

0.19

0.26

0.25

0.25

Results table for current

 Distance in cm Voltage (1) - V Voltage (2) -V Voltage (3) -V Average- V 100 1.95 1.98 2.03 1.95 90 1.89 1.9 1.77 1.77 80 1.87 1.74 1.7 1.74 70 1.46 1.57 1.43 1.46 60 0.14 1.42 1.38 1.38 50 0.98 1.25 1.21 1.21 40 1.02 1.04 1.03 1.03 30 0.55 0.81 0.8 0.8 20 0.46 0.53 0.55 0.53 10 0.44 0.51 0.46 0.44

From these results, I observed that as the distance decreases the current increases.

Conclusion

### Evaluation

This investigation was mainly to fid out weather the length of the wire is proportional to the resistance. My results were accurate because I did not come out with any anomalous results that don’t follow the particular pattern; and because I repeated the experiment, more than once to result with results that are more accurate. My results also support the prediction that I stated (as length increases the resistance increases), which is another factor that supports how successful the experiment was.

There were things that might of affected the amount of current flowing and that is an increase in temperature because this will not make the experiment a fair test. To solve this problem, next time I could place the wire in cold ice to cool the wire down, therefore this will reduce the amount of resistance. Another factor that may have affected the fairness of the experiment is the measurements of the wires because the lengths might have not been accurate.

If I was to repeat this experiment, again I would like to investigate weather the material of the wire affects the resistance.

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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0.4 0.41 0.21 0.51 35 0.42 0.42 0.42 0.27 0.64 40 0.42 0.4 0.41 0.31 0.75 45 0.42 0.39 0.405 0.36 0.88 50 0.4 0.38 0.39 0.37 0.94 Secondary Information for Manganin 24 SWG Length (CM) Average Current (Amps) Potential Difference Average(Volts)

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