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Example
A single-phase motor draws 2.7 A on 240 V and
a wattmeter in the circuit reads 486 W. Find the
power factor.
power factor (pf) = 
P



                  S
 P = 486 W (given)
 S = V I = 240 x 2.7
power factor (pf) = 
 486      = 0.75



                  240 x 2.7

Answer: power factor (pf) = 0.75
7.7.1 Measurement

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7.7.1 Measurement