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World: Global
Region: Micronesia
Subject: Watercraft
Commodity: Electric power

Electric power

Years: 1780 - 2215

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.

Electric power is usually produced by electric generators, but can also be supplied by sources such as electric batteries

It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electric power grid.

Electric power is usually sold by the kilowatt hour (3.6 MJ) which is the product of the power in kilowatts multiplied by running time in hours.

Electric utilities measure power using an electricity meter, which keeps a running total of the electric energy delivered to a customer.

Electrical power provides a low entropy form of energy and can be carried long distances and converted into other forms of energy such as motion, light or heat with high energy efficiency

"History should be taught as the rise of civilization, and not as the history of this nation or that. It should be taught from the point of view of mankind as a whole, and not with undue emphasis on one's own country. Children should learn that every country has committed crimes and that most crimes were blunders. They should learn how mass hysteria can drive a whole nation into folly and into persecution of the few who are not swept away by the prevailing madness."

—Bertrand Russell, On Education (1926)