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A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.
Intermatic Incorporated is an American manufacturer of time switches headquartered in Spring Grove, Illinois. Intermatic was founded in 1891 in Chicago, Illinois as the International Register Company to produce fare registers .
Defrosting is controlled by an electric or electronic timer. For every 6, 8, 10, 12 or 24 hours of compressor operation, it turns on a defrost heater for 15 minutes to half an hour. The defrost heater, having a typical power rating of 350 W to 600W, is often mounted just below the evaporator in top and bottom-freezer models. [ 2 ]
An early switch operating by this principle was invented by Chester I. Hall of the General Electric Company, with a patent filed in 1921 and approved in 1924.Like the modern infinite switch, Hall's invention used a bi-metallic strip, heated by a constant current, to break a connection after a given period of time.
An electric heater is an electrical device that converts an electric current into heat. [1] The heating element inside every electric heater is an electrical resistor , and works on the principle of Joule heating : an electric current passing through a resistor will convert that electrical energy into heat energy.
From January 2008 to May 2010, if you bought shares in companies when J. Christopher Reyes joined the board, and sold them when he left, you would have a -23.0 percent return on your investment, compared to a -20.6 percent return from the S&P 500.
It always goes on sale during Black Friday, and right now, it's only $81 (a pretty solid deal for this time of year). "Tackles even the worst stains," wrote one Amazon reviewer .
One of our most popular items of 2024, AOL readers have purchased thousands of these $10 surge protectors — here's why
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