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Parts Express 3A Variac Variable AC Power Transformer 0-130 VAC
Does the 3A Variable AC transformer work to control the speed of a window fan? On lowest setting the fan goes too fast. Also, if it does slow the fan, does it also change the electricity consumption so at slower speeds it costs less to operate the fan?
I am looking for something to take the 117v that comes from my wall plug (I tested it and it is 117) and turn that into 120 v to run a coffee roaster. I don't what the amp load aspect is? The roaster apparently draws between 15 and 20 amps.
If the unit you have absolutely needs 120 VAC to work properly, you will need to use a power conditioner that regulates output power. I highly doubt this is required, most standard wall powered items work with voltages from 110-120. I would recommend contacting the manufacturer to verify this.
Date published: 2014-11-28
can this be used with a heating mantle rated at 350 Watts, 110 volts. I'd be using the variac mainly to decrease the volts and the heat generated.
Well, at 3amp--110volts, you are right at the line. I suggest a higher amp unit for safety. I'm not saying that this won't work, but experience tells me that anything to do with 110/120 volts,[or higher] a safety margin of 10 to 20% insures not just safety, but long useful life of the unit. See suggestions below.
Date published: 2013-10-22