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The aim of our investigation is to investigate Ohms Law.

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Siobhan HigginsG.C.S.E Science Coursework



The aim of our investigation is to investigate Ohms Law.


In my investigation I am trying to prove that Ohm’s law works.  Ohm’s law is used to find a value in a missing circuit.  Georg Ohm, a German physicist proved that resistance is equal to voltage divided by current.  Resistance is the difficulty in getting the current round the circuit.  I will test the resistance of different lengths of nichrome wire.



Prediction and Hypothesis

        I predict that the wider apart the crocodile clips are, the higher the resistance is.  I know this as the longer the wire, the more free electrons there are, which means more collisions, which results in higher heat loss.


To make the

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- Switch the power pack on and record the voltage and current

Step 4- Turn the power pack off and move the crocodile clip to 90cm

Step 5- Turn the power pack back on and record the Voltage and Current for 90cm

Step 6- Repeat this for 80cm, 70cm, 60cm, 50cm and 40cm.

Step 7- Repeat this process four more times to make the test fair

Step 8

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Graph of results
Discussion of results

On the length/resistance graph I can see that the higher the length, the more potential difference there is in the circuit.  The points of the graph are plotted in a straight line, and there looks to be roughly the same amount space between each point.

On the length/ current graph I can see that the longer the length, the smaller the current becomes.  The points are plotted roughly the same amount of distance away from each other, and have a slight curve to the line.

On the length/voltage graph I can see that the points are very close together and do not have a lot of variation.  The longer the length, the higher the voltage becomes, however the voltage does not increase by a lot.

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