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  2. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    Friction is the least-used of the six methods of producing energy. If a cloth rubs against an object, the object will display an effect called friction electricity. The object becomes charged due to the rubbing process, and now possesses an static electrical charge, hence it is also called static electricity. There are two main types of ...

  3. Wireless power transfer - Wikipedia

    en.wikipedia.org/wiki/Wireless_power_transfer

    A concise explanation of these phenomena would come from the 1860s Maxwell's equations [28] by James Clerk Maxwell, establishing a theory that unified electricity and magnetism to electromagnetism, predicting the existence of electromagnetic waves as the "wireless" carrier of electromagnetic energy.

  4. Electricity generation - Wikipedia

    en.wikipedia.org/wiki/Electricity_generation

    Electricity generation is the fourth highest combined source of NO x, carbon monoxide, and particulate matter in the US. [21] According to the International Energy Agency (IEA), low-carbon electricity generation needs to account for 85% of global electrical output by 2040 in order to ward off the worst effects of climate change. [22]

  5. Electrical grid - Wikipedia

    en.wikipedia.org/wiki/Electrical_grid

    An electrical grid (or electricity network) is an interconnected network for electricity delivery from producers to consumers. Electrical grids consist of power stations , electrical substations to step voltage up or down, electric power transmission to carry power over long distances, and finally electric power distribution to customers.

  6. History of the battery - Wikipedia

    en.wikipedia.org/wiki/History_of_the_battery

    The first consumer grade nickel–metal hydride batteries (NiMH) for smaller applications appeared on the market in 1989 as a variation of the 1970s nickel–hydrogen battery. [27] NiMH batteries tend to have longer lifespans than NiCd batteries (and their lifespans continue to increase as manufacturers experiment with new alloys) and, since ...

  7. Electrical load - Wikipedia

    en.wikipedia.org/wiki/Electrical_load

    An electrical load is an electrical component or portion of a circuit that consumes (active) electric power, [1] [2] such as electrical appliances and lights inside the home. The term may also refer to the power consumed by a circuit.

  8. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    Fourth grade is also the year that most U.S. students learn about their own state's history. [12] In science, most common topics include the rock cycle, fossils, erosion, electricity, forces and motion, light, and heat. Other topics may be taught depending on the school districts or state's curriculum.

  9. Wave power - Wikipedia

    en.wikipedia.org/wiki/Wave_power

    Wave power is the capture of energy of wind waves to do useful work – for example, electricity generation, desalination, or pumping water. A machine that exploits wave power is a wave energy converter (WEC). Waves are generated primarily by wind passing over the sea's surface and also by tidal forces, temperature variations, and other factors.

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