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# An investigation into the factors affectingthe resistance of a wire

Extracts from this document...

Introduction

An investigation into the factors affecting the resistance of a wire

Outline:

Start with a simple paragraph saying what you are going to do.

Factors affecting resistance of a wire:

Material, Temperature, Length and Cross-sectional area

Material is the same (constantan) and we are trying to keep the temperature constant. (you need to say this)

Length and cross sectional areas will be varied. This needs to be done in two separate experiments (Fair Test)

Length and cross-sectional area are the independent (input) variables

The dependent variable (output) is the resistance

Science (essential). Use a textbook/internet/secondary source to find this information. Say where you found it, it must be relevant to GCSE!

Middle

How resistance is related to cross-section (draw a picture, it can also be used as your prediction). Note, there are two plots here! Back up with explanation (more pathways).

Prediction:

Say what you are doing and use your science to back it up

Safety:

The experiment should be safe and you will follow safe laboratory practice

Equipment:

At a glance you might well need: crocodile clips, power supply, voltmeter, ammeter, variable resistor, leads, constantan wire, meter rule, micrometer (to measure wire thickness). Include a circuit diagram. Remember you might need to change equipment after the preliminary experiment. Say what any equipment is used for.

Preliminary Experiment:

Conclusion

Precision:

Voltages, currents, resistances, lengths and wire thickness need to be recorded and presented to the correct level of precision. Say what ranges data will be collected over etc.

Data Tables and Plots:

Must have clear and correct units, titles, etc. These can be presented using spreadsheets.

Plots must be done on graph paper (not computer). Must cover more than half of sheet and have suitable axes. Graphs must be correctly labelled and the points should be crosses drawn in pencil.

Best fit-lines should also be shown. Seek help on this if not sure.

References:

Most likely you found out things, say where you found this information.

Fair Test:

Absolutely crucial to show. In a fair test you only allow one thing to vary.

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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