in case dc we mark as + ve & -ve..but in case a.c. we mark as
ph&N...Y LIKE PLZ TELL ME
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Answer Posted / doss
actually there is both positive and negative voltage occurs in the phase(phase line) with respect to the neutral line. this speed of positive and negative voltage variation is purely depends on the frequency of the ac supply. that is during positive half cycle of ac supply the phase line is positive with respect to the netral line. and during the negative half cycle of ac supply the phase line is having a negative voltage with respect to the neutral line(i.e. neutral is positive voltage with respect to the phase line during negative half cycle of ac supply). so we cannot define positive and negative terminal in case of ac supply since the same terminal can act as positive in one half cycle and during other half cycle the same terminal act as negative. so we simply say it as phase and neutral.
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