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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.
The SCR shuts off when the current falls to zero and the supply voltage drops at the end of the half cycle, ready for the circuit to start work on the next half cycle. This circuit is called a leading-edge dimmer or forward phase dimming. Waveform of the output voltage of a thyristor dimmer set for 60 volts RMS output, with 120 V input.
The major advantage of a lighting control system over stand-alone lighting controls or conventional manual switching is the ability to control individual lights or groups of lights from a single user interface device.
Barack Obama led the pack at 79% in CNN’s first read on his transition approval rating in December 2008, while Biden at 66%, Bush at 65% and Clinton at 62% all received higher approval numbers ...
All directors refers to people who sat on the board of at least one Fortune 100 company between 2008 and 2012. The Pay Pals project relies on financial research conducted by the Center for Economic Policy and Research. Sources: Google Finance, Yahoo Finance, CHS SEC filings .
Matthias Weyland loves having people ask about his balcony. A pair of solar panels hang from the railing, casting a sheen of dark blue against the red brick of his apartment building.