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# I was given three different types of metals and asked to find the resistivity of all three. This was because I wanted to find the best conductor and make a suitable recommendation as to how this metal could be used in the industry.

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Introduction

Resistivity

I was given three different types of metals and asked to find the resistivity of all three. This was because I wanted to find the best conductor and make a suitable recommendation as to how this metal could be used in the industry.

The resistance of a metal is affected by the length and the diameter of the wire. A long wire has more resistance than a short one, while a thick wire has a lower resistance than a thin one. Resistivity is part of the determining factors of resistance.

Equation to find resistivity

R = pl

A

Where p = resistivity

L = length

A = area

R = resistance

Plan

In order to find the

Middle

The possible errors that could be involved in the experiment are the diameter of the wires. As the measurements were rounded of to the nearest mm the magnitude of error can also be calculated

In copper

0.275mm was the first reading I collected

Meaning the max reading would be = 0.2755

And the minimum being                  = 0.2745

Therefore 0.275mm (+or-) 0.0005

Absolute error = 0.0005

% error = 0.0005 x 100

0.275

=0.182% (3.s.f)

(My results and tables can be found on a separate piece of paper)

The comparison of my results and the text book results

Copper

The value I calculated using my data was

= 1.

Conclusion

applications only.

There is also a group of materials that are

specially created that are not conductors until

certain impurities are added.  Then they

become very good conductors, better than any

naturally occuring materials.

Also, cooling materials down to near absolute

zero (Kelvin) make some of them nearly

perfect conductors.  At such a low temperature

the atoms no longer vibrate and electrons are

free to move.

I don't understand your experiment though.

What did the wax melting prove?  A better

conductor generates less heat when carrying

electrical current.

Gus

Conclusion

Copper is the best conductor of the three metals. This is mainly because the electrons in copper can be more easily transferred from one to another. This is important because electric current is based on the flow of electrons through the conductor.

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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