The effective value of an AC = AC/√2.
Example: the effective value of 8.5 V AC is 6.01 V, because 8.5/√2=6.01
Hope that helped :)
By Ohm's Law, resistance is voltage divided by current.
i think average value of current in ac current is zero.
A.C. quantities are always expressed in root-mean-square(r.m.s.) values, unless otherwise stated. For sinsoidal waveform, this equates to 0.707 times the peak value. For example, an AC current with an amplitude of 100 A has an r.m.s. value of 70.7 A.An a.c. current expressed as an r.m.s. value will do exactly the same amount of work as a d.c. current of the same value. In other words, a 50 A (r.m.s.) a.c. current will do exactly the same amount of work as 50 A d.c. This is why r.m.s. values are also referred to as 'effective values' of a.c..
effective values = Vm/SQR(2) max voltage / the square root of (2) same for current This doesn't apply for all periodic functions, only sinusoidal.
Uppercase 'I' is used for DC or effective (RMS) alternating current (which is a scalar value). Lowercase 'i' is used for instantaneous current (usually expressed as a complex value).
Effective = RMS= average Not for a sine wave it isn't. The r.m.s. value of a sine wave is 1.11 x the average, or mean, value. The "effective" value is not a term which I've seen in any of my reference books.
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The rms value of a sine wave current is 0.707 Imax. So the answer to your quesion is 0.707 x 4 = 2.83 A.
EFFECTIVE HOW ABOUT AVERAGE .639 of peak.AnswerThe 'effective' value of an a.c. voltage (or current) is the same as its 'root-mean-square' (r.m.s.) voltage which, for a sinusoidal waveform, is 0.707 Umax.The 'average' value of an a.c. voltage (or current) is zero over a complete cycle, or 0.639 Umax, over half a cycle (usually applied to rectified waveforms).
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By Ohm's Law, resistance is voltage divided by current.
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