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To find out what factors affect the resistance of a wire (besides current of temperature)

Extracts from this document...

Introduction

Aim: -

To find out what factors affect the resistance of a wire (besides current of temperature.) We must use two different variables.

Variables: -

Variables Chosen Variables

Length of wire.

Thickness

Type of wire.

Chosen Variable: -

I have chosen length of wire as one as my variables because it will give me a good range of results. I will be able to compare the results from the shortest wire to the longest. I will start at 100cm then I will take 10cm off each time until I get to 50cm. (100,90,80,70,60,50cm)

The type of wire will also give me a good range of results because I will be able to see if the difference in thickness of wire makes a difference and if the different type of wire makes a difference. (E.g. aluminum and copper.) The thickness will range between 0.71mm and 0.20mm. So I will do as many different types of metal that I can do with in the allotted time.

Prediction: -

For preliminary work, we tested how the temperature of a circuit can affect the resistance of a bulb filament. We altered the temperature of the wire by changing how much power passed through the wire – using a rheostat.

Middle

When you measure the piece of wire lay it out on a one-meter ruler and hold it and one end and count in the appropriate number. You can re measure it if it is not the correct number. The wire must be straight when being measured.

Coil the wire around the pencil and attach to circuit. Make sure no crossovers. (The circuit will short circuit if there are crossovers)

Take readings form ammeter and voltmeter. Do three repeats to improve accuracy. Do the repeats by altering the rheostat. One from either end and one from the middle.

Record results again. Repeat with different length wire.

When doing different type of wire as the variable measure it out to 102cm each time and again measure in 1cm from each end and place the crocodile clips on 1cm in. Then do the same three repeats using the rheostat and then change the type of wire. I will be using the thinner wires so that is why I have gone under 100cm in-between the clips. When attaching the wires make sure that the wire is not long and thin because it will have no amp reading. If the wire is short and fat it will have no volt reading.

Conclusion

Set up apparatus just like circuit shown in the diagram. You will need a voltmeter, ammeter, battery pack (6volt pack), six wires and a piece of Measure out a piece of wire at 102cm and mark in 1cm at each end then clip it right on the 1cm mark.

When you measure the piece of wire lay it out on a one-meter ruler and hold it and one end and count in the appropriate number. You can re measure it if it is not the correct number. The wire must be straight when being measured.

Place the wire over the crack glue the clips to the wall. Make sure no crossovers. (The circuit will short circuit if there are crossovers)

Take readings form ammeter and voltmeter. Do three repeats to improve accuracy. Do the repeats by altering the rheostat. One from either end and one from the middle.

Record results again. Repeat with different length wire.

You could stick the wire across the crack and measure the resistance. The wire would be floppy at the moment. You could then come back after a month and measure the resistance again. If the resistance had increased the wire would have got longer. Therefore the crack would have widened. The apparatus will rest on the floor.

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