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# Resistance of a nichrome wire.

Extracts from this document...

Introduction

Resistance of a nichrome wire.

Aim

My aim is to investigate some of the factors of the resistance of metal wires.

The scientific theory for this experiment is based on ohms law, using ohms law I will find what affects resistance when there are different currents flowing through it.

Hypothesis

The longer the wire the more resistance than the short thick wire of the same material. Sliver is the best conductor, but copper, the next best conductor is cheaper and is used

For connecting wires and is used in electric cables.

When a high resistance is required e.g., to reduce the current in a circuit special alloys are used. The most common of these are constantan (called coutro or eureka) maganin and nichrome. Constantan is used for general purpose, while maganin is used for making high quality standard resistors. Nichrome is alloy from which elements of electric fires are made, since it resists oxidation when red hot. Constan and maganin wires have a resistance of twenty five times and nichrome about sixty times, that of a copper wire. This is my hypothesis for my investigation.

Prediction.

I predict that the longer the wire the higher the resistance will be.

Middle

Off scale

Off scale

Resistance

0.41

0.4

Thick wire

 Length (cm) 10 20 30 40 Voltage 2v 2v 2v 2v Current Off scale " " " Resistance

My results are not accurate therefore I will not be able to find out the resistance so I will not be able to find out the resistance so I will not be able to draw a graph from these results.

I could only do the experiment till 2v as it kept on going off scale and so I could not carry on my experiment to 4v and 6v for either copper or thick wire.

The thick wire kept on going off scale so I was not able to get any resistance.

To find better and more accurate results with better readings for resistance I will carry out my investigation using Nichrome wire with the same method. I believe that the Nichrome wire will give me better results.

Apparatus

The following apparatus will be what I will be using for my investigation:

Voltmeter

Ammeter

Ruler

Crocodile clips (to connect from the ammeter and voltmeter to the wire.)

Masking tape (to hold the wire to the ruler)

Power pack

Nichrome wire

Thick wire

Copper wire

This is how my apparatus will be set up.

Fair test.

To make it a fair test I will repeat my investigation again.

Conclusion

Evaluation.

For this investigation I have gained reliable results as seen on my graph and tables. I also know that my results are accurate and reliable because there are no an anomalous results also because of the precautions I took to make it a fair test.

The crocodile clips and the connecting leads could have affected the fairness of the experiment. They are a different type of metal from the Nichrome wire and may have different properties and therefore different resistance. Therefore the resistance of the Nichrome wire showed up on the multimeter was slightly more than it actually was.

For further investigation I could investigate the other factors/variables that would make a difference in the resistance of a wire. From my own scientific knowledge I believe that the temperature, voltage, resistance, material would change the resistance of a 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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