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# A technician has the problem of making wire resistors of various values. Plan and carry out an investigation to help the technician solve the problem.

Extracts from this document...

Introduction

Statement of the problem.

A technician has the problem of making wire resistors of various values. Plan and carry out an investigation to help the technician solve the problem.

## Background

Resistance is the property of a material, which opposes the current through the material. The larger the resistance the smaller the current flowing through the circuit. Resistance is measured in ohms (Ω). To find resistance we use the formula: resistance = voltage / current  (R=V/I)

To find the current we must use an ammeter and to find voltage we must use a voltmeter.

In series circuits the total resistance is just the sum of all the resistance’s. In a parallel circuit the current through each component depends on its resistance. The lower the resistance the bigger the current that’ll flows through it.

## Variables

There are four variables:

1. length
2. temperature
3. material
4. cross section area of wire

I am going to test number one, the length of wire.

## Predictions

I predict that has I increase the length of wire, the resistance will also increase.

Middle

4

5

6

## Tables

30cm table

 Voltage (Volts) Current (Amp) Resistance (ohm’s Ω) 1 0.17 5.88 2 0.31 6.45 3 0.5 6 4 0.61 6.56 5 0.79 6.33 6

90cm table

 Voltage (Volts) Current (Amp)

Conclusion

Resistance opposes the flow of electricity through my circuit. If I increased the length of wire I would have a greater resistance, this is because the electrons are being slowed down by other particles in the way. So if you increase the resistance you decrease the current.

Improvements

I would carry out the experiment again this time using more wire to see what change that would do to the results and the averages. I might also do the experiment again, but this time increase the length of wire. To see what effect this has on the experiment.

The technician would use my graphs to find out how much wire he/she would need for each resistance.

Take for example if the technician wanted to know how much wire he/she would need for 20omh’s he/she would use the graph by going up 20omh’s in the graph and go across until he/she met the line and then go down. The length of wire in this case would be 90cms.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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