A wattmeter reads 25.34 W. The absolute error in measurement is -0.11 W. What is the true value of power:a)25.23 Wb)25.45 Wc)-25.23 Wd)-25.45 WCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Given that,

Measured value = 25.34 W

Absolute error = -0.11 W

Absolute error = Measured value – true value

⇒ -0.11 = 25.34 – true value

⇒ 25.34 + 0.11 = 25.45 W

Answer

If error is negative so that correction is positive. Then 25.34-(-0.11) = 25.45

Answer

The wattmeter reads 25.34 W with an absolute error of -0.11 W. We need to determine the true value of power.

To find the true value of power, we need to consider the absolute error. The absolute error gives us an indication of how much the measurement can deviate from the true value. In this case, the absolute error is -0.11 W, which means that the measurement can be off by a maximum of 0.11 W.

To determine the true value of power, we need to consider both the measurement and the absolute error. The true value can be calculated by adding the absolute error to the measured value.

The calculation is as follows:

True value = Measurement + Absolute error

True value = 25.34 W + (-0.11 W)

True value = 25.23 W

Therefore, the true value of power is 25.23 W, which corresponds to option B.

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