i am solving the alternating current circuits by corcoran and having a little bit problem with language things(English is not my first language)
a problem says ..
find the instantaneous value of a sinusoidal alternating current having a maximum value of 90 amperes, 60 degree after the currnet passes through its zero value going positive 225 degree after the current passes through its zero value going positive.

please help me with this.

 

The problem statement appears to provide all of the information needed to find the solution.

Since the problem is dealing with a sinusoidal current waveform then you may want to consider calling on your knowledge of the sine-function to derive the value of current at the two given angles. Remember that sine of the angle zero is zero and then go from there.

At least take a shot at a solution and post it here.

hgmjr

 

Remember that the formula of your current is
\( I=I_0 \sin (\phi)\)

\(i_0\) is the maximum value of the current.
\(\phi \) is expressed in degrees and is the current angle of the current and is equal to \(\omega \cdot t \).

 

Thanks for the correction. I usually read my posts once before submitting them. I corrected it myself too.

 

yeah! i solved it. i was a little bit confused with the phi angle, here in the formula mentioned.
the ans was 77.94 A for the 60 degree

thanks guys;