-Energy transfer means the movement of energy from one place to another .
-There are four main ways in which energy can be transferred from one form to another.
- Mechanically : for example, a cue hitting a ball on a pool table.
- Electrically : for example, in an electric circuit, chemical energy can be transferred into to kinetic energy.
- By heating : for example, a toaster transfers thermal energy to bread.
- By radiation : for example, lamps transfer visible light and infrared radiation to the surroundings.
-When electricity moves from a wall plug to a battery through a charger, the energy is being transfered from the wall plug to the battery