how electricity is produced and what is its useful?
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The phenomenon of ejection of electrons from the surface of a metal when light of suitable frequency strikes on it, is called photoelectric effect. The emitted electrons are called photoelectrons.”10-Aug-2016
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What is photoelectric effect?
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CHP and combined-cycle power plants are the most efficient ways to convert a single fuel into useful energy. Hydroelectric turbines use the force of moving water to spin turbine blades to power a generator. Most hydroelectric power plants use water stored in a reservoir or diverted from a river or stream..
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