Before getting to the e.m.f. Equation of a transformer and noting down its derivation it is important to note details of this transformer and how equation is derived. The transformer is that electronic device that helps in transferring of electrical energy in two or more circuits with the help of electromagnetic induction.
While dealing with it, in case sinusoidal voltage is directly applied to basic winding process of a transformer, there is an alternate flux that is set up. With this setting at the core, sinusoidal flux helps in linking secondary winding with the primary one.
This flux functions in a sine mode.