Quotation from: General Science

Written by: Bertha M. Clark


One watt represents a very small amount of electric power, and for
practical purposes a unit 1000 times as large is used, namely, the
kilowatt. By experiment it has been found that one kilowatt is
equivalent to about 1-1/3 horse power. Electric current is charged for
by the watt hour. A current of one ampere, having a voltage of one
volt, will furnish in the course of one hour one watt hour of energy.
Energy for electric lighting is sold at the rate of about ten cents
per kilowatt hour. For other purposes it is less expensive. The meters
commonly used measure the amperes, volts, and time automatically, and
register the electric power supplied in watt hours.
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