How the resistance of a wire varies with length
by Robert Loose
Introduction
The purpose of this coursework is to find out how and why resistance varies with the different lengths of the wire and to study weither resistance obeys Ohm's Law. I will do so by writing the following coursework 'How the resistance of a wire varies with length'. I will write this coursewrork in the following order: Background Information, Prediction, Apparatus, Diagram, Method and How I Will Make it a Fair Test, Results, Graph, Conclusion and Evaluation.
Background Information
The bigger the resistance of the components in a circuit, the smaller the current. The wire connecting the components in the circuit is made of thicker copper wire. This causes negligible resistance to the current.
During the 1820s, a German physicist, Georg Ohm investigated the resistance of different metals. The unit which we now use for resistance is the ohm in honour of him. Ohm's law is the voltage is proportional to the current.
Prediction
I predict that after I have found the average voltage, current and then found the resistance, the graph stating the resistance comparing to the length of the wire, will be at a 45 degree angle, I believe this, because it would have to obey Ohm's Law. I will have to however be aware of the following: The type of wire must be the same, the diameter of the wire must be the same, the temperature of the wire must be the same and the length of the wire must be the same, otherwise, it would effect the results.
