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# Electric current is the movement of electrons through a conductor. In this experiment the wire will be the conductor. When resistance is high, conductivity is low.

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Introduction

Science Theory:

Electric current is the movement of electrons through a conductor. In this experiment the wire will be the conductor. When resistance is high, conductivity is low. Metals conduct electricity well because the atoms in them do not hold on to their electrons very well. Free electrons are created, which carry a negative charge, to ‘jump´ along the lines of atoms in a wire which are in a web structure. Resistance is when these electrons, which flow towards the positive from the negative, collide with other atoms, they then transfer some of their kinetic energy. This transfer on collision is what causes resistance. So, if we double the length of a wire, the number of atoms in the wire doubles.

Middle

## This is how the particles are spread out in a thick wire. As you can see it is a lot of space for the electrons to pass through therefore the a thick wire has less resistance

Conclusion

If this prediction should be true, the graph should be a straight line going through the origin, as current is proportional to the voltage, hence the resistance “I=V” is constant showing that the wire is an ohmic conductor.

As shown in the scientific knowledge the predicted results can be worked out by using the formula R=pL/A. given that you know the length, resistivity of the wire, which is 100 x 10ˉ8, and cross sectional area of the wire. So you can therefore work out the predicted resistance. Also referring to the science theory the thickest wire will have the least resistance and the thinnest wire will have the most resistance

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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