Energy is the capacity to do work — the force behind everything that moves, heats, lights, and powers the modern world.
Energy cannot be created or destroyed, only converted between forms. It exists in two broad categories:
Potential
Stored energy that an object holds because of its position.
Chemical
Mechanical
Nuclear
Gravitational
Kinetic
The energy of motion — carried by anything that is moving.
Radiant
Thermal
Motion
Sound
Electrical