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An Investigation into a Factor That Affects the Resistance of a Piece of Wire

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An Investigation into a Factor That Affects the Resistance of a Piece of Wire Skill P Planning Introduction The resistance of a piece of wire is the determined by the speed that an electrical current can pass through it. Every object that conducts electricity has resistance as no object have no resistance, although some do have very low resistances. This is due to the fact that many different factors affect the resistance. Key Factors The possible factors I can investigate are:- * Diameter * Length * Temperature * Material I shall Investigate Diameter, as it is the easiest to get accurate results with. Research Resistance involves collisions of the current-carrying charged particles with fixed particles that make up the structure of the conductors. A current is the amount of charge that goes through any particular part of the wire at any particular time, which is caused by the movement of electrons, although it is usually measured in coulombs, which is 'electrons per second'. A resistor is a material that makes it hard for electrons to go through a circuit. ...read more.


I shall then get six lengths of constantan wire, each with different SWG (Standard Wire Gauge) ratings (22, 24, 26, 28, 30 and 32) and a length of 60 cm. I shall then attach one length of wire to the circuit using crocodile clips and pass a current of around 2 Volts through it. I shall then take down the Voltage and Amperes and repeat the experiment with a different wire. Once I have done this with all the wires I shall repeat the experiment another two times to enable me to make the results more accurate. Skill O Obtaining Evidence Round SWG Diameter (mm) Voltage (V) Current (A) Resistance (Ohms) 1 22 0.71 0.292 0.59 0.495 1 24 0.56 0.301 0.46 0.654 1 26 0.45 0.304 0.4 0.76 1 28 0.4 0.267 0.3 0.89 1 30 0.31 0.233 0.25 0.932 1 32 0.28 0.198 0.2 0.99 2 22 0.71 0.305 0.6 0.508 2 24 0.56 0.3 0.45 0.66 2 26 0.45 0.306 0.4 0.765 2 28 0.4 0.264 0.3 0.88 2 30 0.31 0.224 0.29 0.772 2 32 0.28 0.194 0.19 1.02 3 22 0.71 0.29 0.575 ...read more.


Also, I could only keep the voltage going through it for a short amount of time, as that would reduce the chance of it over heating. Also, if necessary I could reduce the voltage, which would also reduce the chance of the wire overheating. Also I should have repeated the experiment maybe five times to completely eradicate any wrong results. Improvements on my Method If I did redo the experiment I would use the same material and equipment. I would increase the length to 100cm and do the experiment 5 times, using a different set of wires each time so that the experiment becomes a lot more accurate. By doing this I can prove whether my hypothesis was correct or incorrect. Further Work In order to test my results even further I could repeat the experiment, but with different materials, such as copper or nickel, so that I can see if the same factors affect all wires in the same way. To do this I would use the same lengths of wire I used for Constantan (60cm) and the same Voltage (2 Volts) so that I could compare the sets of results. ...read more.

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