Aim- To investigate the affect of changing the length of wire of resistance.

• Prediction-         I think when the wire gets longer the resistance will increase. The copper will probably have a lower resistance seeing it is a very good conductor and usually used in electrical wires. Aluminum will have a higher resistance because it is not such a good conductor and is not usually used for conducting.

Observation

• Result table

Aluminum

Copper

• Analysis

Aluminum

Copper

• Evaluation

This experiment was very limited and could not find enough data on the experiment and is therefore not very accurate.

The Copper does have a lower resistance level than the aluminum there is enough evidence above to show that.  Copper is usually used in electrical wires because it has such a low resistance, and it is not very expensive. Silver has the lowest resistance of all metals but is very expensive, that is why copper is used. Aluminum is the fourth lowest resistance after silver, copper and gold. Aluminum is not used for electric wires because copper is cheaper and a better conductor.

When we changed the lengths of the wires it seemed that the resistance became lower and the wires got hotter. This is because the electricity has to pass through less wire.

The experiment could have been more accurate if I used the same amount of electricity each time.