Get it? So a spinning loop produces an oscillating flux; if you graphed its values it would trace out a sine wave. That creates an oscillating voltage in the wire, causing electrons to move, and boom: You have alternating current. You just created a generator! This is called electric induction.
Now you can amp this up by replacing that single loop of wire with a wrapped coil containing many, many loops. Oh, it also works in reverse: Instead of rotating a coil in a stationary magnetic field, you can…
