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Homework Statement
Calculate the current in the capacitor shown in the figure below if the voltage input is V(t) = 29cos(377t-30) V, C = 1 micro Farad
Homework Equations
i = C dv/dt
The Attempt at a Solution
I essentially differntiate V(t) and multiply by 1 * 10^-6. I then get a negative amplitude, so I add 180 degrees to the phase angle to get a positive amplitude,
i = 1*10^-6*29*377 * (-sin(377t - 30) = 0.0109sin(377t + 150)
What is the phase angle? The correct answer is 60 degrees. I'm confused about how to get this. I'm getting 150 degrees.
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