[" 0.A step up transformer operates from...

[" 0.A step up transformer operates from "20" volt a.c.,supply and delivers energy at "250" volt."],[" If the transformer is "90%" efficient and the output terminals are connected to a "250V" ,"],[100W" lamp,if the current in primary winding's is "(50)/(x)" amp then "x=]

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[" 0.A step up transformer operates from "20" volt a.c.,supply and delivers energy at "250" volt."],[" If the transformer is "90%" efficient and the output terminals are connected to a "250V" ,"],[100W" lamp,if the current in primary winding's is "(50)/(x)" amp then "x=]

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