Explain how a generator creates electricity.

Explanation:

Interesting question. Basically, it depends on the type of generator. Basically a generator converts mechanical energy into electrical energy.

How does it work? Well let's see an example:

When you have two magnets, they attract to each other right? Well, the reason of this atraction is called "Magnetic Field". When you put a magnet close to another there will be a magnetic force, in other words, one force that will cause any metalic object to be attracted to the magnect. So we could say that there's a magnetic field around the magnet that will make metalic objects be attracted to this magnet.

So, according to physics, if a magnetic field is changing over time it could induce voltage in a conductor.

How can a magnetic field change over time? Well, you can take two magnets and move them with your hands and the magnetic field will be changing over time.

So far we know that, if we change the magnetic field over time, we will generate electricity. But, how do we make the magnetic field change?

Well basically it depends on the type of generator. There are hydroelectric power plants, wind power plants, thermal power plants, etc. Basically, the difference between those power plants is how we make the magnetic field change.

In the case of wind power plants, the wind moves the turbines, that moves the axis of the generator that will make the magnetic field change over time.

In real life, two magnets will never induce enough voltage to power an entire house or a city. So instead of magnets we use what is called "electromagnet", which is basically like creating a magnet with electricity.

This is because when current is flowing through a conductor, it behaves exactly LIKE A MAGNET. So, if instead of magnets we just make current flow through conductors, then the effect will be the same. The magnetic field will change over time when the axis is moved.

I hope I answered your question.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it