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# Investigate how current changes when the thickness of the resistance wire is varied.

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Introduction

To investigate how current changes when the thickness of the resistance wire is varied Aim To investigate how current changes when the thickness of the resistance wire is varied. Scientific knowledge; Resistance is how easily or difficult it is for a current (electricity) to pass through a particular material or component. A resistor is used to control or reduce the current in a circuit. Devices specially made to provide resistances are called resistors. The simplest type of a resistor is a wire placed in a circuit. The greater the resistance of a wire, the smaller the current flow. The resistance of a wire depends on its dimensions as well as on the conducting ability of the material from which it is made from. If it is difficult for electrons to pass through a certain material it is said to have a high resistance. And also, if it is easy for electrons to pass through a material it is said to have a low resistance. Resistance is measured in units called ohms ( ). The size of resistance can be worked out using this simple formula: Resistance = Voltage Current Prediction: I predict that the thicker the wire the lower the resistance and the thinner the wire, the higher the resistance. ...read more.

Middle

> The length of the wire can drastically affect my results for instance, If there were two wires, one longer then the other, then the longer wire should still have the same amount of current flowing through it, but more wire to cover. So the longer wire would have more resistance. Therefore the length of the wire should stay the same during each individual investigation. > The diameter of the wire can drastically affect my results for instance, if there were two wires. One wider then the other, then the wider wire should still have the same amount of current flowing through it but more wire to cover. So the wider wire would have more resistance. Therefore the diameter of the wire should stay the same during each individual investigation. > The affect of heat on a wire is another variable that may affect my investigation. Although this is a minor variable, it is still quite important. For example the resistance will increase if the temperature rises. Therefore the temperature should stay constant throughout my investigation. Fair testing: In order to keep this investigation to run fairly and accurately you would make sure the following things are taken in concern: > The ammeter ...read more.

Conclusion

If I were to do this experiment again I would take a much wider range of readings and more readings so that a more accurate average can be taken. I would also take the reading from the ammeter more than once so I could get an average. This would make the experiment more accurate. I would also use a longer length of wire. I could have also used a higher voltage and used a thicker longer wire. The clips could be attached more carefully, and a more accurate ammeter could have been used to make sure that the current is always exactly the same. Also a better voltmeter would have given better resistance results. The wires and clips used would also have an effect on the resistance and the wires could be insulated better to reduce heat loss. To be more accurate with my results I would place the meter rule directly under the wire, so therefore it would be measured easier and therefore making the lengths more precise. Instead of connecting the voltmeter to the main circuit, I would connect it to the wire that is being tested. I would do this so that the voltmeter is measuring the voltage of just the wire being tested and not the wires of the main circuit as well. ...read more.

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