Will The Length Of Wire Affect The Resistance?

833 words - 3 pages

PHYSICS PRACTICAL ASSESSMENTPLANA variable is something that can be changed or measured. The following is a list of variables that can be changed in the experiment that I will be doing:·Changing the length of the wire·Increasing the cross-section of the wire·Changing the material used·Changing the temperature·Changing the resistance of the wire·Changing the voltage going across the wire·Changing the current going across the wireFor my experiment I will proceed to test out whether the length of the wire will affect the average resistance. Before I can carry out my real experiment, I will need to do a preliminary experiment that will tell me how much voltage I will need for the varying lengths of wire. I will use the wire called WG28 Constantan wire.FAIR TESTINGTo make the experiment a fair test, I will need to keep all the equipment the same, make sure I am as accurate as I can when measuring the varying length of wire and make sure I record all the results more than once in order to get an average and accurate reading of the results.CIRCUIT DIAGRAMSAFETY ASPECTSTo assure that my experiment is going to be 100% safe, I will make sure that I don't use a voltage that is too high which will make the wire get too hot and burn out.I will also make sure that all the equipment is on a flat surface so that it can't fall and damage anyone or anything.We will use a low voltage supply.CALCULATIONTo calculate the resistance of the wire we will have to use Ohms Law which is a triangle of voltage divided by current which will give me the totaled resistance.PREDICTIONI predict that the longer the length of wire that we have; the higher the resistance will be.I think this because there will be more wire in the circuit which will restrict the current which flows through the circuit therefore creating a higher resistance.PRELIMINARY EXPERIMENTRESULTSI predict that the longer the length of wire that we have; the higher the resistance will be.I think this because there will be more wire in the circuit which will restrict the current which flows through the circuit therefore creating a higher resistance.RESULTSI made the results as accurate as I could by taking 5 sets of readings and repeating the experiment twice to draw out an average resistance of the results that I recorded.CONCLUSIONFrom the results that I have...

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