If we connect both wires of step down transformer,then it will give how much voltage?

Answers (1)

Don't do it. You might start a fire. Find a friend who knows these things to do it for you.

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Friend also important...
If both wires combined and connect to power supply then how much voltage it give?

You don't even know what the words mean. Here is a free course:
www.phy.davidson.edu/instrumentation/NEETS.htm