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Find out the resistance of a piece of wire

Extracts from this document...

Introduction

Physics Resistance Experiment

Aim- I aim to plan and carry out an experiment to find out the resistance of a piece of wire. I aim going to use Nickel Crome ( 0.71mm). I will record my results in a table and then transfer them to a graph. Whilst doing the experiment we will use a planned out strategy with sensible lengths of the wire. This means that I had to keep some things the same and but to only have one variable/ difference. So as to produce precise and reliable evidence I will make sure that the same person does the measuring /the same person reads the ammeter and voltmeter/ and one person takes the results. To find the resistance of the wire I will use this equation: R=V/I  (V= potential difference, I= current, R= resistance)

Fair testing- (controlled variables)to make sure that it is a fair test;

We will keep these the same-

  • Same ammeter
  • Same voltmeter
  • Same amount of current running through the wire
  • ruler (for measuring the wire)
  • the same person reading the meters
  • same person measuring
...read more.

Middle

AmmeterVoltmeter Ruler/ meter stickextra wire to make up the circuit

Safety-So as to be safe during the experiment we will all stand at all times and not be silly whilst carrying out the experiment. Also we should not be silly so as not to make the wrong observations or measurements.

Method-

  1. I will carefully collect all the required equipment needed for the experiment.
  2. Then I will sensibly set out the equipment.
  3. Sketch out an appropriate results table.
  4. I will then carry out the experiment, by passing the current through varying lengths of wire.
  5. And recording any findings.
  6.  I have
...read more.

Conclusion

The method I used was suitable and gave me the results I expected. The results were proportional this is because if u take:

30cm=0.83W

60cm=1.6W

1.6 is roughly double 0.83 (0.83+0.83=1.66) This shows that the resistance has roughly doubled over twice the length of wire. Maybe if I had used better equipment I would have had more accurate results.

To improve the experiment I could:

  • I could have used a more accurate ammeter
  • A more accurate voltmeter
  • Attached the crocodile clips more accurately
  • Also the wire got bent throughout the experiment making it hard to measure the wire accurately

Following this would have given more accurate results.

Bibliography-

www.lycos.co.uk

http://www.resistance-technology.co.uk/rdh.htm

http://newton.dep.nl.gov/askasci/phy99/phy99x70.htm

www.yahoo.com

www.google.com

http://www.sci-journal.org/vol3no2/v3n2a3.html

...read more.

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