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Identify the factors that affect the resistance of a wire and investigate one of the factors that affect the resistance of a wire in detail to find a more definite link.

Extracts from this document...

Introduction

Coursework Assessment 1                                                       Rhiannon Smyth

Identify the factors that affect the resistance of a wire and investigate one of the factors that affect the resistance of a wire in detail to fin a more definite link.

I am going to identify the factors that affect the resistance of a wire and investigate one of the factors that affect the resistance of a wire in detail to find a more definite link.

Factors that affect my investigation are called variables; these are the thickness of the wire, length of the wire, temperature, material and size of current.

In my experiment my independent variable is the length of wire and the dependent variable is the resistance of the wire.

The thickness of the wire, temperature, material and the voltage across are the controlled variables in my experiment.

I predict that as I increase the length of the wire, the resistance will also increase.

An electric current is when electrons are free and can flow along the wire from negative to positive.

...read more.

Middle

0.033

60

0.033

70

0.037

80

0.039

From these experiments it can be seen that as you increase the temperature, the resistance decrease and as you increase the length of wire the resistance also increases.

Apparatus for the main experiment:

In this experiment the only main risk is that the wire could get hot and you could burn yourself, so you should take care and do the experiment as quickly as possible.

Here is my method for the main experiment:

Collect the apparatus shown in the diagram.

Place the wires 10cm apart and take a reading and record your results in a table.

Repeat this at: 10cm, 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm and 90cm and record your results.

Once you have all the results, go back down from 90cm to 10cm and record the results.

...read more.

Conclusion

Evaluating the conclusion

My conclusion stated that ‘from looking at my graph and results, it can be seen that as I increased the length of wire, the resistance also increased. The length is directly proportional to the resistance, because a straight line goes through the origin.’ I think that my conclusion is valid because my results are reliable. My graph I have drawn has a line of best fit and all of the points are very close to it.

The aim of my investigation was to identify the factors that affect the resistance of a wire in detail to find a more definite link. Here is a plan that could improve the accuracy and reliability of my results:

Collect the apparatus shown in the diagram.

Also collect a razor blade.

Place the wires 10cm apart using the blade and take a reading and record your results in a table.

Repeat this at: 10cm, 15cm, 20cm, 25cm, 30cm, 35cm, 40cm, 45cm, 50cm, 55cm, 60cm, 65cm, 70cm, 75cm, 80cm, 85cm and 90cm and record your results.

Once you have all the results, go back down from 90cm to 10cm and record the results.

Then calculate the average and plot a graph using your averages.

Draw a line of best fit on your graph.

Clear away all apparatus.

...read more.

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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