What is the Initial Phase Angle and First Maximum Current in an AC Circuit?

[steveandy2002]

Homework Statement

i = 15 sin(100π.t + 0.6)
a) I need to state the initial phase angel in rads and degrees.
b) I also need to work out current at first maximum value.

Homework Equations

i=A*sin(ωτ+∅)

The Attempt at a Solution

a) ∅=100∏*0+0.6
∅= 0.6 rads. ∴0.6*180/∏=34.37746771°

b) first current max =∏/2 rad's
100∏τ+0.6=∏/2
100τ+0.6=1/2
200τ+1.2=1
t=1/(200+1.2)
t=4.970178926*10^-3

 

[Steely Dan]

You've made an algebraic mistake in your part b), but yes, you are on the right track. By the way, a thread like this belongs in the "Introductory Physics" forum, not the Calculus forum.

 

[steveandy2002]

You've made an algebraic mistake in your part b), but yes, you are on the right track. By the way, a thread like this belongs in the "Introductory Physics" forum, not the Calculus forum.

where abouts did i go wrong?

 

[tiny-tim]

100∏τ+0.6=∏/2
100τ+0.6=1/2