Originally Posted by geeyathink
I can see a motor using both legs because they dont actually come into contact with each other
Sure they do. They just wind round and round in the motor a bunch of times first. When the motor starts the magnetic field creates enough resistance to keep a short circuit from happening.
A common light bulb is also nearly a dead short. The bulb works like the heating element. It has a high resistance. When the electricity is applied it heats up. In the case of the bulb it also becomes bright and it is put in a glass vacume so that you can see the light.
A heating element heats up without alot of light. This is because it is made from a different type of metal. The key is that the resistance is high when they are on.
This is confusing becuase with the average meter the resistance seems like it is near zero when they are off. The resistance of these metals does change with temperature.
In the case of a motor with a copper coil. it is the magnetic field that creates an impeadance. impeadance works like resistance in an electrical circuit.