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Resistance of a wire.

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Introduction

Resistance of a wire Aim To investigate how the length of a wire affects its resistance. Apparatus 3 Cells (power source) Ammeter (to measure current) Variable resistor ( to make sure that the maximum currents going round) 2 Crocodile clips Voltmeter (to measure Voltage) 8 Leads (to connect circuit together) 60 cm ruler with wire attached (to measure wire accurately as possible) Diagram Prediction I predict that the shorter the wire the les resistance or the longer the wire the more resistance. This is because there is less atoms for the electrons to get past. Method 1. I will set up the apparatus as in the diagram above; the positive crocodile clip is attached at 0cm, and the negative is moved up and down the wire, stopping at 5, 10, 15, 20 etc all the way up to 50cm. ...read more.

Middle

0.3 0.6 0.9 1.2 1.6 1.9 2.2 2.6 2.9 3.2 Resistance (Ohms) 0.75 1.5 2.25 3 4 4.75 5.5 6.5 7.25 8 Analysis I have found out that the longer the wire the more resistance (as I predicted) and I also found out that the length of the wire is directly proportional to the resistance. I can see this from the graph because it is a positive correlation and is a straight line. The resistance increase as the length of the wire increases; this is due to the idea of free moving electrons being resisted by the atoms in the wire. In a longer piece of wire, there would be more atoms for the electrons there would be more atoms for the electrons to collide with and so the resistance would be greater. ...read more.

Conclusion

If I did it again I would repeat the measurement of the volts more then just 3 times to make sure it is accurate I would probably repeat it 5 times. I think my results are good because my graph shows that the length is directly proportional to the resistance. I know it should be like that because it can be scientifically proven like I have done above. I think the fourth result is anomalous because it is not quite on the line of best fit this could be because the wire was getting a little bit hot. I think my result could be accurate detailed enough to explain reliably what I have found out because I did some research to see how the graph should look and it said it should be a straight line to show the length is proportional to the resistance. To extend my investigation I could see if the thickness of the wire effects the resistance. ...read more.

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