Q5Basic Electrical Engineering

The Root Mean Square (RMS) value of the induced Electromotive Force (EMF) in a transformer winding is derived directly from Faraday's law of induction for a sinusoidal varying flux.

Where $f$ is the AC supply frequency in Hz, ${\varphi }_m$ is the absolute maximum magnetic flux in Webers (which equals Maximum Flux Density $B_m\times$ Core Area $A$), and $N$ is the number of turns on the winding.