how the length of a wire affects the resistance

How the length of a wire affects the resistance

Aim: To investigate how the electrical resistance of a wire changes in relationship to its length.

Variables
1.Temperature: When electrons pass through a wire, they give off some of their energy to the atoms, the atoms in the wire will start to vibrate because of their increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. This increase in collisions means that there will be an increase in resistance.
2.Wire length: If the length of the wire is increased then the resistance will also increase as the electrons will have a longer distance to travel and so more collisions will occur. Due to this the length increase should be proportional to the resistance increase.
3.Cross Section: As the cross-sectional area increases the resistance decreases.
4.Metal Type: Copper is a good conductor and is used for connecting wires. Nichrome has more resistance a...