Ok so, let’s say you wrap a piece of wire into a coil/spring. Now, put a magnet inside that coil. At rest, the magnet is producing a magnetic field, but otherwise doing nothing. But if you move the magnet, give it some kind of velocity, some kinetic energy, then the magnetic field it produces will begin to generate electricity in that wire coil surrounding the magnet as it continues to move. It stops generating power the moment the magnet stops moving. If you’ve ever seen a hand-crank radio or flashlight, that’s how those are devices powered without any batteries or external charge. The crank moves a magnet that’s surrounded by wire.
This process we’re doing is converting mechanical/kinetic energy into electrical energy. A pulley/belt connected to the car’s engine spins a rotor extremely fast. That rotor rapidly spins a magnet that’s surrounded by wiring, which is how we go from chemical energy (gasoline) to kinetic energy (pistons in the engine moving, pulleys, belts, gears, and rotors spinning) to electric energy (spinning magnetic field generates charge).
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