Energy

Energy

In physics, energy is the ability of a body or system to do work or produce a change; or is a property of objects that is transferable among them via fundamental interactions, which can be converted in form but not created or destroyed and expressed usually in joules or kilowatt hours (kWh).

The joule is the SI unit of energy, based on the amount transferred to an object by the mechanical work of moving it 1 metre against a force of 1 newton.