Numerical - Relative error for given wattmeter readings

Q.  The true power measured by the wattmeter whose range is 500 W and an error of ± 2% of full scale deflection is 150 W. The relative error while reading 150 W will be
- Published on 03 Nov 15

a. ± 4%
b. ± 5.39%
c. ± 6.67%
d. ± 1.5%

ANSWER: ± 6.67%

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