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Investigation to how length affects the resistance of a wire.

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Introduction

WAYLIN TO'S GCSE PHYSICS COURSEWORK Investigation to how length affects the resistance of a wire. I am going to investigate how length affects the resistance of a wire. There are three main factors which affect the resistance of a wire: The material of the wire. (What the wire is made out of eg. Copper, nichrome) The length of the wire. The thickness of the wire. (The diameter of the wire) Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around 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 light bulb. Resistance is measured in ohms. The symbol for an ohm is ?.A resistor has the resistance of one ohm if a voltage of one volt is required to push a current of one amp through it. To work out the resistance of a wire one must use the formula: I =current V=voltage R=resistance Resistance is affected by length because if the wire ...read more.

Middle

I regulate the voltage and current with the variable resistor to make sure it won't affect my results 4. I will record the readings in the ammeter and the voltmeter calculate the resistance by dividing the voltage by the current. 5. Work out the averages and plot a graph of the results Safety To make my experiment safe so that neither myself nor anyone else in the labartory was hurt I used the equipment very carefully taking special care of the wire which will heat up. I did some preliminary work to test my method and to see what sort of results I would get. This helped me to improve my method, predict my results, and also decide what range of values to measure. The results of my preliminary work are AMP VOLTS LENGTH(cm) RESISTANCE (?) 0.38 5.21 100 13.7 0.38 2.85 50 7.5 0.38 1.13 20 2.9 0.38 0.03 10 1.6 After doing preliminary work I have decided to take measurements between 100cm and 10 cm with intervals of 10cms, because I thought that this would clearly show any pattern/give sufficient results. ...read more.

Conclusion

The shape of my graph is a straight line I think my readings were accurate,. I repeated the experiment 3 times so the results were more reliable and accurate. When I repeated my experiments I found that the results were similar. On my graph the points are close to the best fit line, this show that there is a strong relation between . I did not have any anomalies The reason why increase in length increases resistance is because the electrons have to travel a further distance, resulting in more collisions in the wire. Overall I am happy with my resuls and they were how I expected. I thought my method was good, if I could improve my method and experiment I would measure the wire up more accurately because it had slack also in some cases the readings on the ammeter and voltmeter took quite long to settle, if I waited longer for readings the results would be more accurate. I thought my readings had sufficient and fair intervals. Other experiments to investigate resistance could be to see how resistance affects different material wire? The amount of heat generated? Or How thickness of wire affects resistance? ?? ?? ?? ?? ...read more.

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