A generator is said to be offline when it is not providing electrical power to the grid. A generator may be taken offline for repairs or because your city is not using a lot of power. For example at night a generator may be taken offline because your city is using less power than it does during the day. Wire and magnetic fields are used here extensively. In fact there is a lot of wire inside a generator.
Lets start our tour through the generator at the shaft.
The shaft has a rotor built around it and is about 3 feet thick and some 20 feet long. It has two sets of windings. The ends of the wire are connected to the brushes. The voltage connected to the brushes is approximately 375 volts and the current is approximately 900 amperes. The two sets of wire are called poles.