Electrical Generator
Electrical Generator is a machine that makes power from a spin.
Think of it this way
A hand-crank egg beater sits over a bowl. When you spin the crank, the beaters turn and move the eggs around. The spinning motion creates action in the bowl. A generator works the same way — spin goes in, electricity comes out.
Explaining electrical generator by grade level
When wind pushes a blade, the blade spins. That spin moves a part inside the machine. The part makes power that can light a bulb. The shape of the blade helps it spin more or less.