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Resistance of Wire.

Extracts from this document...


Rejwanul Islam 10E/MA10        *Information from internet and books*        28/04/2007

Science Coursework: Resistance of Wire


My Aim

My aim is to find the relationship between a 26SWG Nichrome wire and a power pack set from 2-8 volts.         In order to carry out this investigation, I will use these apparatus listed:

  • Power Pack
  • Ammeter (Digital)
  • Voltmeter (Digital)
  • Meter of Nichrome wire
  • Resistor
  • Connecting leads/Wires

These are the main things that I used for the experiment. The digital ammeter and voltmeter will be used to see how much current and voltage the wire will use. These apparatus will be fully described on the next page.

Scientific Knowledge

As I was planning out how to conduct my experiment, I came across some scientific findings.

Ohm, George Simon, was a German physicist known for his research on electric current. He was born in Erlangen and was educated in the university there. From 1833 to 1849 he was director of the Polytechnic Institute of Nuremberg and from 1852 until his death he was professor of experimental physics at the University of Munich. He formulated the relationship between current, electromotive force, and resistance that is known as Ohm’s law is the law of current flow. The unit of electrical resistance was named the Ohm in his honour.

Electric Circuit (path of an electric current) the term is usually taken to mean a continuous path composed of conductors and conducting devices and including a source of electromotive force that drives the current around the circuit.

...read more.



Safety Issues

The experiment has to be safe. Due to having 4 working in a group, the safety issues will have to be obeyed.

  • The power pack has to be switched off when not in use, just in case some one gets injured from electrical current.
  • Bad use of equipment. People can get hurt if some one decides to swing wires with anything attached to them.

Will the test be fair?

To keep my experiment fair, I need to keep the thickness same when investigating length. Since the temperature of the wire may affect the resistance of the wire, I shall keep the current through the wire low so that wire will not heat up. I shall use 10, 20, 30, 40, 50, 60, 70, 80, 90, 100cm length of each wire in turn. I shall take the readings from the voltmeter and ammeter to find out the resistance for each length of wire. I will choose the thickness of the wire.  My test will be a fair test because:

  • I will use the same power pack voltage throughout the experiment.
  • I will measure the length of the wire correctly.
  • The same piece of wire will be used throughout the experiment.
  • The same resistor will be used throughout the experiment.
  • The ammeter and voltmeter used must contain the same scale throughout the experiment otherwise we will end up with uneven results.

My Prediction of what the experiment will be like

My prediction is that when the length of the wire is increased the resistance will also increase.

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I could have recorded the results another two to three times ad this would have gave me accurate results extremely precise.

Reliability of the experiment

To improve the reliability of the results the tests were repeated three times. The three set of results were very similar, if not the same, this confirmed that my results were accurate and reliable. The voltmeter and ammeter had digital scales and therefore giving the exact readings that were extracted without any fault.

Further Work/Improvements

After effectively carrying out the investigation, I was obliged to contemplate the concept of further work.  If I could come across the idea at first, I could have done better if I used different wires. Therefore expanding my results and comparing them with the results from a different experiment using a different wire. This would have identified, which wire has the most resistance, when the length is gradually increased.

        I could also use thin and thick wires for the experiment which will show that if the wire is thin less current flows through and therefore the resistance will be low. But if the wire is thick, the current will be far greater and the resistance will be greater than before.

        Another means of furthering my work will be to investigate the effects of the temperature, on the resistance of the wire. I would have to conduct two experiments for this experiment. The apparatus will have to be identical to conduct a fair test. The difference between both experiments will be by measuring the temperatures, in which the experiments are conducted. This would then let me evaluate on the kinds of temperatures, altering the resistance of the wire.

...read more.

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