a 230 V, 10 A, single-phase energy meter makes 90 revolutions in 3 minuts at half load rated voltage

a 230 V, 10 A, single-phase energy meter makes 90 revolutions in 3 minuts at half load rated voltage and unity pf if the meter constant is 1800 revolutions/Kwh, then its error at half load will be

 

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