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Investigating Which Factors (Variables) Can Change the Resistance of an Electrical Wire.

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Introduction

INVESTIGATING WHICH FACTORS (VARIABLES) CAN CHANGE THE RESISTANCE OF AN ELECTRICAL WIRE. INTRODUCTION. I have found the four main variables that can effect the resistance of an electrical wire. The four main variables are, 1) THE LENGTH OF THE WIRE. 2) THE THICKNESS OF THE WIRE. 3) THE TEMPERATURE OF THE WIRE. 4) THE MATERIAL OF WHICH THE WIRE IS MADE OUT OF. The best way for me to investigate the resistance is by using a famous German scientist's method, George Ohm's. The method is now known as the OHM'S LAW. Which is: RESISTANCE = VOLTAGE R= V CURRENT I The variable I will investigate is "How the length of the wire can effect the resistance of the wire". PREDICTION. I have read many textbooks and researched into the variable I'm going to investigate on the Internet and after all this my prediction is. ...read more.

Middle

* I will than start the investigation. * I will start taking and recording my results in my table for each length. I will take the results three times to get a average voltage and current. * I will carry on recording my results down and continuing with the investigation till I have covered the whole length of the one-meter ruler. * Then I will start to find the resistance for each length. I will find the resistance by using the OHM'S LAW. R= V I * After finding the resistance for each length I will than make a graph to show my results. RESULTS. LENGTH VOLTAGE AVERAGE CURRENT AVERAGE RESISTANCE 20 CM N/A N/A N/A N/A N/A 30CM 1.5 1.4 1.4 1.4 1 1 1 1 1.4/1= 1.4 40CM 1.5 1.5 1.5 1.5 0.8 0.8 0.82 0.8 1.5/0.8= 1.87 50 CM 1.51 1.5 1.5 1.5 0.7 0.7 0.7 0.7 1.5/O.7= 2.14 60 CM 1.5 1.5 1.5 1.5 0.6 0.6 ...read more.

Conclusion

Even though my graph and table of results clearly showed a pattern I had come across a few odd results. Lengths 60 and 70 cm the results were odd. The resistance went down when the table was clearly starting to show a pattern. To make sure I didn't make a mistake a carried out the investigation for those two particular results twice. But I still got the same results. The reason for my odd results could be because of a number of things. For instance I could of have read the results wrong or when taking the results from the ammeter and voltmeter I often tend to saw it fluctuating so maybe I had not taken the right and accurate result. If I were given the chance to do the experiment again I would do a number of things differently. Such as making sure the wire completely straight and didn't have no crinkles in it also, I would try to get the most accurate reading if the needle fluctuated. ...read more.

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