autotransformer dimmer

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Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics

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Snowshoe hare (Lepus americanus) with its Summer coat on the left side and its winter coat on the right.

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

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earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

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Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

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Salem Witch Trials. Photogravure after the painting by Walter McEwen titled - The Witches - circa 1890s.

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autotransformer dimmer

electronics

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stage design and lighting control

In stagecraft: Dimmers
The autotransformer dimmer controls current flow by varying the voltage in the circuit. It was rarely used to control stage lights, but at the turn of the 21st century it was still being used in some theatres to control house lights.
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