How to use the alternating current formula?

How to use the alternating current formula?

1. Voltage instantaneous value E = EMSin ω T, current instantaneous value I = imsin ω T; (ω = 2 π f) 2. Electromotive force peak value EM = NBS, ω = 2blv, current peak value (in pure resistance circuit) Im = EM / R total 3. Effective value of sine (cosine) alternating current: e = EM / (2) 1 / 2; u = um / (2) 1 / 2; I = im / (2) 1 / 2 4

Is the average value expression of alternating current 1 / 2bsw

It is not necessary to know the expression of alternating current. If it is a function of sin or cos, the expression of average value is
√2/2BSW.

Conversion of angular velocity unit in instantaneous expression of alternating current
It is known that the expression of instantaneous value of alternating current is I = 3.11sin (314T) A. the time from t = 0 to the maximum value of the first current is 0.005s
How can the rad / s of angular velocity be converted to frequency and period? I haven't learned it for a long time

The maximum value is 3.11 when sin (314T) = 1. The first time is when t = {2n π + π / 2} / 314. N = 0, t = 0.005