Calculate Instantaneous Voltage of 50 Hz 3-Phase Supply - 100 V

[DunceKirchhoff]

A 50 Hz ac three phase supply has a peak voltage of 100 V. Calculate the instantaneous voltage of each phase at a time of 7.5 ms.

Looked all over google and can't seem to find an equation for this?

Can anyone point me in the right direction?

 

[NascentOxygen]

A 50 Hz ac three phase supply has a peak voltage of 100 V. Calculate the instantaneous voltage of each phase at a time of 7.5 ms.

Can you attach a pic of the illustration that accompanied this question?

 

[donpacino]

Think about what an AC waveform is. Its a sine wave. the standard form for a sine wave is

V=A*cos(wt+theta) where A=amplitude, w=frequency in radians, & theta=delay.

note with a 3phase system the voltages are evenly out of phase with one another, so they are evenly spread across the unit circle (360 degrees)

Using this information give it another try