I have no clue what this formula is about could some one please point me in the write direction.

 

I suggest making a chart for yourself. Do you have a spreadsheet like Excel you can use? Plot current i against time t. You'll want at least 100 values of t and you'll need to experiment with the increment. If you make a formula to calculate all the x values based on a single input in your spreadsheet, this will be easy peasy. I'd start with ∆t = 0.001 and see what you get.

 

As this is a sinusoidal current, i = Ipk *sin(wt) so peak is 31 A (rms is 22A) convert w to frequency and 1/f = periodic time

 

Do you understand this equation?

y = sin ( θ )