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Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate.. He invented a version of the light-dimmer switch for use in homes around the United States and led his Lutron Electronics Company into the production of lighting controllers.
When the dimmer is at 50% power, the switches are switching their highest voltage (>325 V in Europe) and the sudden surge of power causes the coils on the inductor to move, creating a buzzing sound associated with some types of dimmer; this same effect can be heard in the filaments of the incandescent lamps as "singing". The suppression ...
Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]
Command & Conquer: Red Alert 2 is a real-time strategy video game which was released for Microsoft Windows on October 25, 2000 [1] as the follow-up to Command & Conquer: Red Alert. Red Alert 2 picks up at the conclusion of the Allied campaign of the first game. Its expansion pack is Command & Conquer: Yuri's Revenge, released a year later in 2001.