what type of circuit?
on/off switch for a light?
more info plz...
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I'm wew here, but what I think they may be asking is this. Your power source is, 110v@20A, you need the this power to run PWM, that switches you neon sign transformer on and off (to control its frequency), but you also need you neon sign transformer to run off the same 110@20A
how would you know that?
almost everything has a load, a power source, a conductor (wires), and a switch
Do you mean like a flashlight?
Or your homework?