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Flicker is expressed as ___________________ where, Vmax and Vmin represent the change in voltage over the nominal voltage Vnom
fv = 100 x ( Vmin - Vmax)/ Vnom
fv = 100 x ( Vnom - Vmin)/ Vmax
fv = 100 x ( Vmax - Vmin)/ Vnom
fv = 100 x ( Vmin - Vnom)/ Vmin