Generating EMF in a Coil with a Bar Magnet - 65 Characters

[brian.green]

Exactly what and how generate EMF in a coil when I move a bar magnet in it? How the changing magnetic field makes electrons to move? (I mean quantum mechanically.)
As I read somewhere when I close the circuit (put a load, a LED for example on the coil) the generated current in the coil will be "curled" but what does it mean visually? Electrons go around and around in a small circle path? How far these electrons can move in the wire at all?
How can I calculate the wattage what I can generate, what is the equation? (wire diameter, turn on the coil, strength of the magnet (the B field), velocity of the magnet, angel between the coil and the magnetic field...)

 

[gtoguy97]

When a bar magnet is moved in a coil of wire, it generates a changing magnetic field which causes electrons to move in the wire. This movement of electrons is known as an electromotive force (EMF).Quantum mechanically, the EMF arises from the quantum mechanical spin-orbit coupling between the electrons and the changing magnetic field, causing the electrons to move in the direction of the field.The current generated in the coil due to this EMF is said to be "curled" because the electrons move in a small circle path. The distance the electrons can travel in the wire depends on the resistance of the wire.The wattage that can be generated can be calculated using Ohm's law, which states that the voltage (V) across a circuit is equal to the current (I) multiplied by the resistance (R). Therefore, the wattage that can be generated is equal to the voltage multiplied by the current:Wattage = V x IThe parameters that affect the wattage generated include the wire diameter, the number of turns on the coil, the strength of the magnet, the velocity of the magnet, and the angle between the coil and the magnetic field.