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Resistance in a wire.

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Introduction I have been asked to investigate what factors could affect the amount of resistance in a wire. For this investigation, I believe that altering the length of the wire throughout the experiment will be the best method. Investigation into how the Length of Wire in a Circuit affects the Resistance Planning Section Science Theory The information in the Science Theory section and the Prediction was taken from Nuffield Co-ordinated sciences and The Usbourne Illustrated Dictionary of Science. The various factors that could affect the resistance in a wire are as follows. The thickness of the wire - if a wire has a diameter of 4mm then there will be more space for the electrons to move in and electricity can be passed quicker that in a wire with diameter of 2mm. The material the wire is made of - if the wire in question was made from gold, which is an excellent conductor for electricity as it has a large number of electrons that move freely, so the electricity passes from one atom to the next. Voltage - Voltage may also be linked to the amount of resistance in a wire as the more electricity there is trying to get through the wire the harder it will be as there will be less space for it to fit through, so therefore there will be more resistance. ...read more.


back up my theory that it is directly proportional, these will not be included in the final results table or plotted on my final graph. The readings that I collected will probably be slightly different to my final results, as it is only a trial run. The table also goes to 5 cm, I was initially going to stop at 5 cm however the wire burned out before we could note the results, so any following tables will only go to 10 cm. Preliminary Results Table Voltage in volts Current in amps Length Of Wire (cm) Resistance in Ohms 2.00 2.00 100 1.00 1.90 2.00 95 0.95 1.80 2.00 90 0.90 1.60 2.10 85 0.76 1.60 2.10 80 0.76 1.40 2.20 75 0.64 1.30 2.30 70 0.57 1.30 2.40 65 0.54 1.30 2.50 60 0.52 1.20 2.60 55 0.46 1.20 2.90 50 0.41 1.20 3.00 45 0.40 1.10 3.20 40 0.34 1.10 3.30 35 0.33 1.00 3.50 30 0.29 0.90 4.00 25 0.23 0.90 4.20 20 0.21 0.50 4.60 15 0.11 0.20 5.00 10 0.04 N/A N/A 5 N/A Apparatus There will be many different pieces of apparatus that will be used in my experiment, these are listed below: * A piece of wire 100 cm long. * Pieces of wire that will connect up the voltmeter, the ammeter, the power supply and the 100 cm piece of wire. ...read more.


11. Remove the crocodile clip at 100 cm and slide down to 95 cm - repeat process as at 10. 12. Continue process with intervals of 5 cm until you reach 10 cm. 13. Work out the resistance for this set of results using the equation R = I/V. 14. Repeat the process of obtaining results twice more also calculate the resistance. 15. You can now calculate the average results for the volts, current and resistance. I will be keeping everything like the width of the wire and the material that the wire is made of constant throughout the experiment, the amount of voltage from the power supply will also remain the same as will the connecting wires to ensure that it is a fair test and will not affect the resistance. To make sure that the results I take are accurate, I will tape down the wire on to the board and place the crocodile clips directly on the measurement that I am taking. Throughout the experiment, I must ensure that everything is being done safely, this is not a very dangerous experiment but I must keep the power supply and the wires well away from water and keep the power low. Despite this I will be unable to control human error, to try and guard against this I am taking three sets of results and will be taking 19 in each set, this limits what can go wrong, there will also be an average table created from my three sets of results. ...read more.

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