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2. Sources of electrical energy - Wikipedia

   en.wikipedia.org/wiki/Sources_of_electrical_energy

   Light: Energy produced by light being absorbed by photoelectric cells, or solar power. Chemical: Energy produced by chemical reaction in a voltaic cell, such as an electric battery. Pressure: Energy produced by compressing or decompressing specific crystals. Magnetism: Energy produced in a conductor that cuts or is cut by magnetic lines of ...

3. List of energy resources - Wikipedia

   en.wikipedia.org/wiki/List_of_energy_resources

   Energy portal; These are modes of energy production, energy storage, or energy conservation, listed alphabetically. Note that not all sources are accepted as legitimate or have been proven to be tappable. Bus running on soybean biodiesel. Atomic energy; Alternative fuel; Alternative fuel vehicle; Banki turbine; Battery (electricity) Bioalcohol ...

4. Energy - Wikipedia

   en.wikipedia.org/wiki/Energy

   In general relativity, the stress–energy tensor serves as the source term for the gravitational field, in rough analogy to the way mass serves as the source term in the non-relativistic Newtonian approximation. [12] Energy and mass are manifestations of one and the same underlying physical property of a system.

5. Electricity - Wikipedia

   en.wikipedia.org/wiki/Electricity

   The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre, the vector direction of the field is the line of greatest slope of potential, and ...

6. List of light sources - Wikipedia

   en.wikipedia.org/wiki/List_of_light_sources

   This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...

7. Renewable energy - Wikipedia

   en.wikipedia.org/wiki/Renewable_energy

   As an energy source, biomass can either be used directly via combustion to produce heat, or converted to a more energy-dense biofuel like ethanol. Wood is the most significant biomass energy source as of 2012 [103] and is usually sourced from a trees cleared for silvicultural reasons or fire prevention.

8. Voltage - Wikipedia

   en.wikipedia.org/wiki/Voltage

   Voltage, also known as (electrical) potential difference, electric pressure, or electric tension is the difference in electric potential between two points. [ 1 ] [ 2 ] In a static electric field , it corresponds to the work needed per unit of charge to move a positive test charge from the first point to the second point.

9. Electricity generation - Wikipedia

   en.wikipedia.org/wiki/Electricity_generation

   Electricity generation is the process of generating electric power from sources of primary energy. For utilities in the electric power industry , it is the stage prior to its delivery ( transmission , distribution , etc.) to end users or its storage , using for example, the pumped-storage method.