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# Resistance Investigation

Extracts from this document...

Introduction

Resistance Investigation The four factors that affect the resistance are: 1) Length 2) Thickness 3) Material 4) Temperature Aim My aim for this test is to see how the resistance varies with the length or the wire. Plan For this test I am going to use a standard test circuit. I am going to use a standard test circuit because it includes all the equipment needed for my test. To measure the resistance, I have to get the voltage and divide it by the current from the amp meter readings. This can be put into simple formulae which is: R= V/I In this experiment I am going to use: * Amp meter (placed in series)- to measure the current flowing thought the wire * Voltmeter (placed in parallel)- to measure the voltage flowing thought the wire * Component (Wire) - to do my experiment on. I am going to use a Nickel Chrome 28swg with a thickness of 0.376mm because it is a good conductor and offers some resistance. * Battery- to give me a source of power. ...read more.

Middle

I also have to keep the current going through the wire constant. Safety To keep my experiment safe I am going to switch the power source on for 3 seconds, record the results then switch it back off and leave it to cool for a minute. This way I wont burn myself and I wont put anyone in danger. I also am going to use a meter stick, im using a meter stick just incase the wire gets hot it wont burn anything except the stick. Prediction I predict the greater the length of the wire the more resistance there will be, therefore the shorter the length of the wire the less resistance there will be. Here is a graph showing what I think is going to happen: The values I could fill in the table before I start are: * Length * Voltage * Current * Resistance * Material * Thickness I can fill in these because the thickness, length and the material are going to be the same thought out the experiment I can also write in the voltage, current and resistance because they are what I am hoping to find. ...read more.

Conclusion

If the wire is much longer the same would happen accept there will be more collisions which will produce more heat. In the EDEXCEL Modula science book it quotes "If you increase the resistance- then less current will flow". This makes me think, the longer the wire the more the resistance because the current will have to be pushed around which will cause resistance. This also can be shown on a diagram that I got from a work sheet. Diagram A has a larger resistance than diagram B. Therefore to push the current around the circuit the pump would have to apply more force, which again would cause resistance. Evaluate My method and results were accurate, I had a good understanding of what I had to achieve and what I was likely to find in my test. I believe my results were correct because my graph didn't have an outlier. If I had to do my experiment again I would do more tests and pick out the good 5 results and work out the average. For a definate fact I can say by looking at my graph, the longer the wire the greater the resistance is. I can now say my prediction is correct, from my graph and my research. ...read more.

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