Specific latent heat is the energy needed to change the state of a substance.
Lifting an object in a gravitational field transfers energy into the objects gravitational energy store. Gravitational potential energy is the energy an object has due to its height above Earth.
The efficiency of a device is the proportion of input energy that is converted to useful energy.
The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device.
The unit for work done is the joule (J), or Newton meter (N-m). One joule is equal to the amount of work that is done when 1 N of force moves an object over a distance of 1 m.
Forces and Work DoneRead More »
A transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to "step up" or "step down" voltages and is based on the magnetic induction principle.
A current-carrying wire or coil can exert a force on a permanent magnet. The force increases if the strength of the magnetic field and/or current increases. This is called the motor effect.