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I am not an eletrician, know little about electronic though. REcently I am interested on making a styrofoam cutter using a hot wire. I find this website http://www.nichromewire.biz/power_supply_design.html He use a light dimmer before the line goes to the transformer. I wonder why not use dimmer after the current through the transformer ? What is the effect to put the dimmer before and not after the transformer ? I just think logicly that a line current ( 110volt or in my country 220volt ) when goes to a dimmer will produce a little low than 110 volt, but the output would be the same - let say 12 volt ? ) I also saw that such diagram also been use to dimm a led bulb, or 12 volt halogen.
And got the following answer:
The current the dimmer has to handle will be smaller if it is placed in the primary of the circuit.