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In books and various websites, I have seen that the reactive power is measured using two wattmeter method. This method is applicable to a balanced three-phase system.

But at home, just a single phase is supplied. And we use different types of load. For example water pumps, electric fans, LED, etc. Is there any way to find the value of the imaginary power? The load impedance is also unknown. (As it varies time to time)

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Measure the real power and also calculate the apparent power from V and I (RMS values) then, use Pythagoras to compute the other side of the triangle (the so-called reactive power): -

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  • \$\begingroup\$ @SadatRafi are you done with this question and answer now? \$\endgroup\$ – Andy aka Jun 18 at 14:12

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