In physics and other sciences, energy is a scalar physical quantity that is a property of objects and systems which is conserved by nature. Several different forms, such as
- Nuclear and
- Mass have been defined to explain all known natural phenomena.
Energy is converted from one form to another, but it is never created or destroyed. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether’s theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.
Law of conservation of energy:
Energy is subject to the law of conservation of energy. According to this law, energy can neither be created (produced) nor destroyed itself. It can only be transformed.
Fuel sources that are other than those derived from fossil fuels. Typically used interchangeably for renewable energy. Examples include:
- Wind – is the conversion of wind energy into useful form, such as electricity, using wind turbines.
- Hydropower – or hydraulic power is the force or energy of moving water.
- Biomass – refers to living and recently dead biological material that can be used as fuel or for industrial production. It can be broadly defined as solid, liquid, or gas fuel consisting of, or derived from biomass.
- Tidal power – is a form of hydropower that exploits the movement of water caused by tidal currents or the rise and fall in sea levels due to the tides.
- Wave – refers to the energy of ocean surface waves and the capture of that energy to do useful work
- Solar – is energy from the Sun. This energy drives climate and the weather supports virtually all life on Earth.
- Geothermal – Geothermal energy is energy obtained by tapping the heat of the earth itself, usually from kilometers deep into the Earth’s crust.
- Hydrogen & Fuel Cells – A fuel cell is an electrochemical energy conversion device. It produces electricity from external supplies of fuel (on the anode side) and oxidant (on the cathode side).