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Find out how the length of wire in a circuit affects the resistance.

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Introduction

Aim

To find out how the length of wire in a circuit affects the resistance.

Equipment

 8  x Flying Leads

 2  x 1.5V Batteries

 1  x Meter Measuring Board

 1  x Ammeter

10 x different lengths of copper

 1  x Volt Meter

 1  x Crocodile Clip

Diagram

Method

*Gather the apparatus needed for the experiment

*We set up the apparatus as shown on the diagram by doing the following

*Attach the first piece of copper wire to the measuring board.

*Attach one flying lead from the batteries to the ammeter.

*Attach another flying lead from the ammeter to the measuring board.

*Use the length of wire needed by connecting this to one side of the

  Measuring board and then connect a crocodile clip to the other side of  

   the wire.

...read more.

Middle

*Do this three times for each size of copper wire to make it a fair test.

*Repeat this test but change the length of copper wire by 10cm each time  

  until you reach one meter.

*To work out the resistance for each size of copper wire, use the equation

Resistance = voltage (pd) / Current (amps)


In 1826, George Ohm discovered that; the current flowing through a metal wire is proportional to the potential difference across it.

(Providing the temperature remains constant)

Fair Test

To make my experiment a fair test, I collected the results for the experiment three times, only changing one variable. By doing this, I will end up with more accurate results.

Safety

  • Do not drink or eat in the experiment area.
  • Be careful with the copper wire because it may be hot and could burn you.

Prediction

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Conclusion

I think that test two and three had acceptable results but test one had unusual results compared to them. The reason for this may be that we used too many flying leads, resulting in an increase of resistance or the piece of wire may not have been connected properly. The room temperature may also have been a cause of this.

I believe that the method I produced is appropriate for this experiment because it gave me accurate results.

I could improve this experiment if I had more accurate equipment which would improve my results greatly.

A relevant experiment that would work well with the one I have just done would be to test if other types of metal wire that also conduct, affect the resistance in them.

...read more.

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