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# Resistance Investigation

Extracts from this document...

Introduction

Resistance.

Aim: to try and find out the different resistances of a wire at different lengths and thickness.

Resistance (r)= Voltage (v)

Current (c)

Equipment

Power pack- so that we can safely control the voltage we put into the wires.

Voltmeter- so that we can measure the voltage across the whole circuit.

Ammeter- so that we can measure the amps across the circuit.

Wires- to connect the circuit.

Crocodile clips- to connect the wire to the circuit.

Ruler- to measure the lengths of the wire.

Tape- to secure the wire to the ruler.

Nicrome wire- the wire used for the experiment

Wire cutters- to cut the wire.

Safety- to make this a safe test I must:

• Keep the voltage down to a maximum of 6 volts.
• For a small length of wire I must keep the voltage down so that it does not burn.
• I should not touch the wire while it is connected to the circuit a sit would be very hot and I could get an electric shock.
• To make sure no mistakes are made while setting up the equipment, as it could be dangerous if I do.
• I will follow the instructions given carefully.

To make a fair test I must:

• Measure all of the wire at the correct length
• Use the same amount of voltage for each experiment
• Record my data accurately

Middle

Results

 Length(Cm) Power(Volts) Amps(Average) Voltage (average) 5cm 2v 0.4 1 10cm 2v 0.2 0.9 15cm 2v 0.16 0.9 20cm 2v 0.14 0.8

Conclusion

I also could see no problem with the procedure in which I managed to record this data. There is one problem and that is the results can never be perfect because of some factors such as room temperature. If the wire is heated up the particles inside of it become charged which would affect the results of the experiment.

Conclusion

I find out that my prediction was wrong because I find out from my results that the longer a piece of wire is the more the resistance is, this is because there are more resisters in a longer bit of wire then there is in a shorter bit of wire.

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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