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# Perform an experiment involving investigation into the resistance of a wire.

Extracts from this document...

Introduction

Planning

I am going to perform an experiment involving investigation into the resistance of a wire.

The current flowing through a metal wire is proportional to the potential difference across it (providing the temperature stays constant).  The greater the resistance the more voltage is needed to push a current through the wire.  The resistance of a wire is calculated by:

Resistance (R) = p.d across wire (V) / current through wire (I)

There are four factors that can affect resistance:

• Varying length – as the length increases, the resistance increases.
• Varying cross sectional

Middle

I will be investigating two of these factors.  I will be changing the length and the cross sectional area of the wire.  I will use nichrome wire throughout the experiment.

I am going to use a metre length of wire attached with sellotape at both ends to a metre stick.  Using two wires and a battery pack I am going to run a current through the wire at various lengths starting at 10cm and continuing at 10cm intervals.  I will do this by keeping one wire at 0cm, and placing the other one at points along the wire.

Conclusion

metre stick

battery pack

2 connecting wires

ammeter

voltmeter

sellotape

## Safety

In order to make sure this experiment is safe I will not use an output greater than 4 volts and make sure there is not a current running through the wire for too long; otherwise the wire will overheat.

## Fair testing

I will keep this experiment fair by only changing one variable at a time, i.e., either the SWG or the output.  I will use the same output when completing a single set of results where possible.

## Prediction

I predict that the longer the wire the greater the resistance.  This is because there are more electrons creating obstruction for the current as the length of the wire increases.

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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