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Subjects>Engineering & Technology>Electrical Engineering

Why power factor in cos phi why not in sin phi?

Yasirtariq ∙

Lvl 1

∙ 10y ago

Updated: 4/28/2022

Because it has to be 1 when the phase angle is zero.

Wiki User

∙ 10y ago

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How do find voltage from mvar and mw?

mw is the unit of real power and mvar is unit of reactive power. You should now the current and power factor angle to calculate the voltage.p=vi cos piq=vi sin piAnswerI think you mean MW, not mw -capital 'M' mega; lower-case 'm' milli!!! And the symbol for watt is a capital 'W', not a lower case 'w'. Also, I think you mean 'Mvar'(mega, not milli!).

What is the formula for calculate 3 phase power MVAR?

Q = 3 Vph Iph sin(phase angle) = 31/2 Vline Iline sin(phase angle)

Why the form factor is 1.11 for sinusoidal ac?

The defination of form factor is FF=RMS/avg(abs(f(t))) for sin waveform RMS=0.707*peak(f) avg(abs(f(t)))=2/pi*peak(f) so FF=0.707/(2/pi)=1.1106

What angle is the voltage increasing at its fastest rate?

This is a simple derivation problem. Take the derivative of the AC voltage waveform (I'll assume sin (t)), and set the derivative equal to the maximum value it can attain (which is 1): cos (t) = 1, t = 0 degrees, thus for an AC waveform of y = sin(t), the fastest increase in voltage occurs at 0, 360, etc. degrees. The fastest decrease in voltage will occur at 180, 180 + 360, etc. degrees.

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