Find if the length of copper wire affects the resistance in a basic circuit. I will be interested in amps and volts in the circuit.

 To make my results as accurate as possible I will make sure the sun or any light is not shining onto the mixture and letting the wire get hotter and making it easier for the electricity to run through the circuit.

PREDICTION   For our experiment we our doing six different measurements 100, 80, 60, 40, 20 and 00cm and I think we will see some sort of pattern. I think the largest measurement, 100cm, will have the most resistance and the smallest length will have the least resistance.

PRELIMINARY WORK  in our preliminary work we found our results were not what they should be they were of no fixt pattern therefore our results were no good but our results were good so we know what not to do if we did it again.

So when we did it again we had major changes to carry out. Our main was fault was our circuit was in the complete wrong order also our measuring was no good so now we knew what to do for next time. Here are our results for our preliminary work.

EQUIPMENT

1 volt and amp meter

1 length of copper wire

several crocodile clips and wire

1 power pack

1 metre rule

4 strips of masking tape

1 coil

ANALYSIS   by just looking at the table I can see the amps, volts and calculated resistance increases as I predicted from the start, also I can see that anything below the length of 40cm results are the same, amps volts and resistance. I can see this even clearer on the two graphs I have produced.

From 60cm and up I can see that as the amps goes up the volts go up and therefore there is an increased resistance, apart from one in the last test even though the amps and volts are higher the resistance decreased this result is called an anomaly. I cannot really see this clearly in my graph and am not really sure how to show it.

EVALUATION    I’d say my quality of results are good fairly easy to read and understand so overall I am pleased with my first attempt. In my results there is fixed pattern best shown in the graphs. Apart the odd one on each graph the results fall into a neat best-fit line.

I have one anomaly, which was in the final test, unlike all the others that have the rule the higher the amps and voltage the higher the resistance, the resistance in the anomaly decreases. I not quite sure if we carried out the final experiment wrong, I took a miss reading or just simply calculated wrong but I think its more than likely that I simply miss calculated.

I feel I had pretty good method as I had only one clear anomaly, which really is no bad thing, talking to other members of the class I think I had a better method and were more organized than first thought. At this time I can not really think of a procedure that be easier or one that would give more precise results to make them almost perfect I also think my method was pretty reliable.

CONCLUTION   I have learnt two things one, the longer the copper wire amps and volts are increased, two longer the wire more the resistance. Saying this my prediction has been proven correct, overall the experiment and coursework has been quite successful. I am very pleased with all outcomes.