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# Aim: To investigate the correlation between the thickness of a wire and it's resistance. Equipment:

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Introduction

Electricity Coursework                       Jasmine Akov

Aim:

To investigate the correlation between the thickness of a wire and it’s resistance.

Equipment:

• Crocodile clips
• Power pack
• Ammeter
• Voltmeter
• 1 meter ruler
• Wire clippers
• 6 pieces of wire – of different thicknesses

Experiment:

I will use 6 wires all of different thicknesses, they must all be made of the same metal (Nickel Chromium). One at a time I will attach them to a circuit with a current of         0.5 amps, for each wire I will record the reading on the voltmeter and I will use the ammeter to make sure the current stays at 0.5 amps. I will record my results in a table and will conduct the experiment twice to compare my results, they should roughly be the same.

Method:

I will collect 6 pieces of wires all different thicknesses, I will cut the wires with wire clippers and make them all the same length of 25 cm. I will connect each wire one at a time to a circuit with a current of 0.

Middle

Wire No. Diameter      Voltage  Current  Resistance  Length      ¹/R             D²

(S.W.G)  (MM)           (V)          (A)         (Ohms)       (cm)

22         0.71        0.3              0.5      0.6                25        1.67        0.50

24        0.5          0.5              0.5      1                25        1        0.31

26        0.45        0.9              0.5      1.8                25        0.56           0.20

28        0.40        1.1              0.5      2.2                25            0.45           0.16

30        0.31        1.5              0.5      3.4                25            0.29           0.09

32        0.28        1.9              0.5      4.2                25            0.24           0.07

To work out the ¹/R column I had to divide each resistance by one.

To work out the D² column I had to times the diameter by itself.

Graph:

(There is a hand

Conclusion

I measured the gradient (steepness of the line of best fit) on both of my graphs.

I used this formula to find the gradient: M=Y÷X

Y = Dependant variable

X = Independent variable

The gradient on the first graph was slightly lower than the gradient on the second one, as the second one was higher.

I believe I carried out enough experiments to be certain that the thicker the wire is the less resistance thereof.

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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