Here is an easy way to test and identify the type of current you're working with in your workshop or laboratory. All you need is a transformer.
-- You simply hook up the unknown current to one winding of the transformer, then watch the transformer.
-- If voltage and possibly current come out of the other winding, then your supply is Alternating Current (AC).
-- If only smoke comes out of the transformer, then your supply is Direct Current (DC).
