Physics Coursework Theory - Resistance of a Wire

Theory behind my experiment

Thickness (cross sectional area of the wire), length, and temperature all have some effect on the amount of resistance created in a wire. Another factor is the conductivity of the material we are using. Some metals are just more electrically conductive than others. As long as I use the same type of metal for each wire, my experiment will remain fair.

Cross Sectional Area

The thicker the wire, the less resistant it is. This is because there are more electrons in the metal that are free to move as a current. Also, there is more space for the electrons to flow, so more can fit down. This is often compared to water in a pipe; the thicker the pipe, the more water that can flow through it.

Temperature

The temperature of the wire also affects the resistance. This happens because as the metal gets warmer, the metal ions in the wire gain kinetic energy