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Investigate how the length of wire in a circuit, the type of metal used and the width of the wire affects the resistance of the circuit.

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Introduction

Stefan Piatek

Introduction:

In this piece of work I will investigate how the length of wire in a circuit, the type of metal used and the width of the wire affects the resistance of the circuit.

Prediction:

I know that as you increase the length of a wire, the resistance increases, (directly proportional) I know that if you make the wire thinner the resistance should increase as well (inversely proportional) This is because in a thicker wire there are more electrons to travel through the wire, which would increase the current, and decrease the voltage since V=IR, or R=V/I if the current goes up and the voltage goes down, the resistance must go down. No two different metals will have the same resistance so one of them will have more resistance than the other .I am expecting to find; the longer the wire, the higher the resistance, the thinner the wire the higher the resistance and one of the wires to definitely have more resistance than the other

Apparatus:

Ammeter

Voltmeter

A power pack

Crocodile clips

Wire connectors

Variable resistor

1m of 28 SWG Maganin

1m of 28 SWG NiChrome

1m of 30 SWG NiChrome

Method:

Warning: Electrical equipment in use, wire can get hot, be cautious

...read more.

Middle

Attach crocodile clips to one end of the NiChrome 30 SWG wire and another at the 5 cm markerTurn on power supply and copy down the Volts and Amps shownRepeat this 3 times (for reliable results)Repeat 11. 12. 13 moving up 5 cm each time until the length is 1m

In this experiment there are certain factors that will affect the accuracy of results, they are:

Temperature of the circuit, time taken to take measurement of voltage and amps, and length of the wire, type of wire, thickness of the wire. I will make sure, that out of these, I will keep the temperature of the circuit (do this in the same room, and since there is central heating, there should be a constant temperature), the time taken to take the measurements constant. The length of the wire, type of wire, and thickness of the wire are variable in this experiment. I have kept the temperature and time taken to take measurements constant because it will make my results more accurate, if the wire is hotter, then the resistance will go up, therefore making my results less accurate,

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Conclusion

(1), (2), (3) Were most likely errors in equipment because they were 3 consecutive errors, or the wires were hotter than usual

(4) This was most like a human error, writing down the wrong number

(5) This was most likely equipment error, because there is no real reason why it should be higher

(6) This was most likely caused by an equipment error or the wires were hot or the time taken to write down results was more

(7) This was most likely caused by an equipment error or the wires were hot or the time taken to write down results was more

My experiment worked pretty well, except the fact that I didn’t do exactly as I planned, an only did up to 60 cm on the NiChrome and I only started on 10 cm on the Maganin. If I was to do this experiment again, I would repeat all of the measurements 10 times, so that I could get a definite conclusion. I think I have a wide enough range, and enough measurements in that range, but I would like to have an airtight room kept at a zero degrees so that the temperature will be the same and I would definitely like perfectly accurate equipment, and a power pack that I know always outputs the same voltage constantly.

...read more.

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