The equation of an A.C. is `I = 100 Sin(3/4πt )`.Find the effective value of current.

The equation of A.C. is I = 40 sin 400 pit . Find its frequency and rms value of current.

In an a.c. circuit the instantaneous current is given by I = sqrt2 sin 100 pit ampere. The effective value of a.c. in amepres is