I bought a transformer and had studied theoretically how it works but i saw phase shifting etc. and ideal is not so real in real world. would there be a lagging or leading of phase in a transformer? no circuit load involve. What will it be then and how much is the discrepancy? I plan to create a diy watt meter, voltage and current input is important but i want isolation so i used transformer but i know phase is important when reading voltage and current right?