You will discover that this produces a variable electric current known as alternating current, which is equal to:

emf= Em · sen(2·π·f·t+φ) , where f is the frequency of the rotation of the coil, φ is the initial phase angle (the initial angular position of the coil) and Em is the maximum value of the electromotive force, which is given by the following formula:

Em=n·B·S· w  where w=2·π·f,  n is the number of loops, B is the magnetic induction and S is the surface enclosed by each loop.