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Resistance Investigation.

Extracts from this document...


Emma Walters

Resistance Investigation

Background Information:

I know that R=V/I.  I know that Resistance (R) is measured in Ohms; Voltage (V) is measured in Volts and Current (I) is measured in Ampere.

In a series circuit:

RT = R1 + R2 + R3…etc.

VT = V1 + V2 + V3…etc.

IT is the same all the way round.

In a parallel circuit:

1/RT = 1/R1 + 1/R2 + 1/R3…etc.

VT is the same all the way round.

IT = I1 + I2 + I3…etc


My aim is to find the relationship between length and resistance of a wire.


6 Wires

Power pack


2 Crocodile clips



1 Nichrome wire, 24SWG, 0.56mm.



I will collect the apparatus, and set up the circuit that I have drawn above.  I will start by measuring out the wire (5cm, 10cm, 15cm, 20cm, 25cm, 30cm, 35cm, 40cm, 45cm, and 50cm).  I will check the circuit is correct, and I will set the power pack so that an input of 2V pushes the current round the circuit.  For each length of wire I will record the Voltage and current flowing through the circuit.  I will repeat these results twice, so that I can get the average.

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Resistance (R=V/I)







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        I think that my experiment did not work too badly, although there were some things that I could improve on.  The wire that I used was not very straight, which would have affected the length when I measured it, this would have affected my results.  For next time I need to make sure that the wire is straight, so that I can get more accurate results.  

Heat was given off from the wire, which I noted in my observations, this would have affected the resistance a bit.  Next time I can get rid of this by having a lower voltage pushing the current around the circuit, such as 1V, instead of 2V, and maybe wait until the wire is cool before I test the next length.  This should stop the resistance being altered to something higher then it should be.

        Overall my experiment went generally well.  I ended up with a straight-line graph, although it was not exactly through the origin, like it should have been in theory.  I was able to repeat my results to make them more accurate.  I have no points that are that far out of place; they are all fairly close together in the straight line, so my experiment was successful.

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