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Re: [TCML] Variac

"Variac®" is a registered trademark of the late General Radio Co. The term has loosely come to mean any variable ratio auto-transformer which can be adjusted by turning a dial. The theory of the Variac® is the same as that of the auto- transformer. Several companies make simular units but under different names. One company has the trademark as well as the patents for the Variac®. Try lookiing up "auto-transformer". Auto-transformer is often defined as a transformer where one winding serves as both primary and secondary. Any text book that deals with transformer design should give you what you are looking for. Hope that gives you clue.


On Oct 28, 2008, at 8:50 PM, jhowson4@xxxxxxxxxxx wrote:

I am just curious but does any one have any equations that describe the variac. I did a quick google search and did not come up with anything.

thanks for the help,
Jay H

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