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Resistance in Nichrome Wire.

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Introduction

Renny Popoola 11d

Resistance in Nichrome Wire

Aim: To investigate the resistance of Nichrome wire. To find out how the length of a wire affects its resistance.

Plan:

Background information:Resistance is the force, which opposes the flow of electric current round a circuit so that energy is required to push the charged particles round the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long e.g. the filament across an electric bulb. Resistance is measured in Ohms (~). A resistor has a resistance of one ohm if a voltage of one volt is required to push a current of one amp through it. The total resistance of resistors in series is the sum of the resistance of each one.

George Ohm discovered that the electromotive force or potential difference of a circuit is directly proportionate to the current flowing throughout the circuit. He also discovered that a circuit sometimes resisted the flow of electricity. He then came up with a rule for working out resistance.  Resistance is equals to Voltage divided by current and the formula could be written like this:

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This also tells us how to work out the current and voltage using other information. Therefore if I have a voltage of 6 volts and a current of 2 amps, my resistance will be 3 ohms.

Resistance is shown to depend on the type of metal.

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Middle

Material e.g. nichrome, copper

Therefore I had to control this to get a fair experiment. I used the same wire all through so therefore the material, length and thickness are the same for all the results. My results were also reliable as  I tried to leave the clips on

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Conclusion

Evaluation: My experiment was quite accurate and I tried to make it a fair test by controlling some variable. There were a few anomalies as between the lengths 70cm and 75cm, the resistance decreases from 2.73 to 2.46. Also between lengths 85cm and 90cm, the resistance decreases from 2.80 to 2.28. Apart from these instances, my results were quite accurate.

I used the same piece of wire so the diameter of the wire was the same. I could have used different wires to also notice how the diameter of a wire affects its resistance. I could have had twenty different apparatuses at the same time so they would have been left for the same amount of time.

I could also have used more ranges of wire lengths e.g. fifty different set ups of differences of 2cm in lengths. This way, I might have been able to get a more accurate increase in every centimetre. I also could have checked the results using different voltages. Throughout the experiment, my power pack supplied 6 volts; I could have set it to supply 3 volts or 12 volts and also note down the results when the amount of volts have changed. Therefore I will have had a wider range of results and more information to come up with a more accurate conclusion. On the whole, I think my experiment was quite informative and I achieved the results I thought I would.

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