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ee484,
For simple sinusoidal waveforms, Power is the RMS voltage times the RMS current component that is in-phase with the voltage. P =VICos(Theta), where theta is the phase angle between voltage and current. As an extreme example, consider a purely capacitive load. In this instance, the current leads the voltage by 90 degrees. For 1/2 of the cycle, the capactor is drawing current from the source. For the other 1/2 of the cycle, the capacitor is supplying current to the source. The net power is zero (Cos[90 Degrees]) = 0.
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VA is simply the product of the RMS voltage and RMS current.
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For the example you give, the phase angle between the voltage and current is the arcCosine of 350/500.
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Non sinusoidal waveforms can be analyzed by doing a Fourier analysis of the voltage and current waveforms, analyzing each frequency component separately and adding the results.
Regards,
Kral
VA (volt amper) is the active power, that is multiplication of Voltage (measured with volmeter) and current (also measured with volmeter), but there are the reactive power.
W (watt) is power is the add ,not algebraic but vectorial, of active and reactive power
Reactive power can't be measure by normal multimeter and this energy travels by the line and cannot be used by the Load.
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