Let us write the equation for alternating current in general form
i(t)=Im⋅Sin(2πf⋅t)i(t)=I_m \cdot Sin{(2 \pi f \cdot t)}i(t)=Im⋅Sin(2πf⋅t)
Then
Peak current Im=77AI_m=77AIm=77A
Frequency f=3142π=3142⋅3.14=501sf=\frac{314}{2\pi}=\frac{314}{2\cdot 3.14}=50 \frac{1}{s}f=2π314=2⋅3.14314=50s1
Time period T=1f=150=0.02sT=\frac{1}{f}=\frac{1}{50}=0.02sT=f1=501=0.02s
Instantaneous value at t=2 ms.
i(0.002)=77⋅Sin(314⋅0.002)=45.24Ai(0.002)=77 \cdot Sin{(314 \cdot 0.002)}=45.24Ai(0.002)=77⋅Sin(314⋅0.002)=45.24A
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