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Resistance of a Wire.

Extracts from this document...

Introduction

Physics Coursework- Resistance of a Wire. My Aim: My plan is to find out how the resistance of a wire changes across the length of the wire. My Prediction: My prediction is that the longer the length of the wire is, then the higher the resistance will be because there is more space for the electrons. Quantitative Prediction: If we double the length of the wire, so that then the resistance would be able to cross the wire as well. Scientific Knowledge: Definitions: (I)- Current is what flows around the wire of a circuit. Currents flow from points of high voltage to some points of low voltage on the surface of a conductor. Current is measured in Amps (A). (R)-Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows large amounts of current to flow through the component. Resistance is measured in Ohms (?). (P)-Power is the amount of current times the voltage level at a given point measured in wattage watts. (V)-Voltage is the difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit and it is measured in volts (V). Ohms Law: Ohms law is named after its very own discoverer called George Ohm. ...read more.

Middle

10. write down your reading 11. and finally keep on repeating the method for each interval until you have got all or your required results. Analysis In my prediction I said that the longer the length of the wire, then the higher the resistance will be, because there is more space for the electrons to move around in. This was correct for me because in my graphs, the one which shows resistance against the length of a wire shows the positive correlations, which therefore shows that the resistance must be increasing. Also from the experiment, I found out that the resistance keeps on getting higher as the length of the wire keeps on increasing. I also found out that as the length of the wire is increasing, the voltage increases but the current decreases. To prove this I have my graphs to show this, as the voltage graph shows that the longer the wire gets then the higher the voltage keeps on getting. The graph that shows length against voltage shows that the longer the wire, the higher the voltage gets, which therefore gives my graph a positive correlation. This is because the longer the wire then the more distance the atoms have to travel, therefore as it tries to go along the circuit wires, it collides with the electrons which then causes much more resistance. ...read more.

Conclusion

* To make sure that don't mess around with the crocodile clips as they could be very dangerous. * To make sure that the wires that I am using are not left trailing around on to the floor as someone could trip up over them and hurt themselves badly. Some of the improvements that I could make the next time if I am going to do this particular experiment could be: * get better equipment. * Get better wires. * Get a better and accurate voltmeter. * Get a better and accurate amp meter. * I could make sure that the battery that I have stays constant, so that it gives me a continue supply of electricity. * Make sure that I have better crocodile clips, so that they can then grip onto the wire much more better, as the ones I had before kept on sliding of sometimes. * Change the length of the reading that I am going to take to 5cm instead of 10cm per reading so that I will be able to analyse the results that I get in greater detail * And finally the length and the thickness of the wire, as some wires were too short and could not extend enough, so that you would be able to get a reading of it and the thickness of the wire to see if changing the thickness of the wire effects the results in any way. By Ankush Taheem 10L6 ...read more.

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