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# Portal:Energy

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## The Energy Portal

In physics, energy is an indirectly observed quantity. It is often understood as the ability a physical system has to do work on other physical systems. Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.

Sustainable energy is the provision of energy that meets the needs of the present without compromising the needs of future generations. Sustainable energy sources are most often regarded as including all renewable energy sources, such as hydroelectricity, solar energy and power, wind power, wave power, geothermal energy and power, biomass fuel and energy, and tidal power. It usually also includes technologies that improve energy efficiency.

While many renewable energy projects are large-scale, renewable technologies are also suited to rural and remote areas, where energy is often scarce yet crucial in human development. As of 2011, small solar photovoltaic (PV) systems provide electricity to a few million households, and micro-hydro configured into mini-grids serves many more. Over 44 million households use biogas made in household-scale digesters for lighting and/or cooking, and more than 166 million households rely on a new generation of more-efficient biomass cookstoves.

## Selected page

Electricity basics. Some basic definitions, equations and analogies of electricity.
 Term Symbol Unit Description Water Analogy Voltage V volt (V) Pressure (Potential) difference due to charge difference Head: Pressure (Potential) difference due to height difference Current I amp (A) Flow of charge in charge/time or coulombs/sec Flow: Flow of water in volume per time such as liters/sec Resistance R ohm (Ω) Opposition to the flow of charge Friction: Opposition to the flow of water Power P watt (W) Energy/Time = Power=Current*Voltage Power: Power=Current*Pressure Energy E watt-hour (Wh) The ability to do work Energy: The ability to do work

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How to Build a Mechanically Powered Battery Charger for LED Lighting