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A wattmeter has a full scale range of 2500 Watts. It has an error of 1.2% of true value. What would be range of reading if true power is 1250 Watts.

A wattmeter has a full scale range of 2500 Watts. It has an error of 1.2% of true value. What would be range of reading if true power is 1250 Watts. Correct Answer 1235 W to 1265 W

We have,

Error = 1.2 % of true value

Wattmeter has full scale range of 2500 W

True Power Measured = 1250 W

True Power Measured = 1250

⇒ Error = ±1.2 % of 1250 = 0.012 × 1250 = ±15 W

Hence, range of Wattmeter reading will be,

From (1250 - 15) W to (1250 + 15) W

∴ Reading of wattmeter = 1235 W to 1265 W

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