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power is the product of voltage and current.so we can
measure the value of power just by using ammeter and
voltmeter.......then why do we use a wattmeter?
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Answer Posted / nageshwaran.n
No doubt, we could use Voltmeter & Ammeter for calculating
Power but only Apparent Power that too at that instant.
Apparent power = voltage X current,
Actual RMS Power (real power) = voltage X current X power
factor
And to measure real power we need Wattmeter only.
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