The limiting er ror of measurement of power consumed by

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The limiting er ror of measurement of power consumed by and the current passing through a resistance are ± 1.5% and ±1% respectively. Then the limiting error of measurement of resistance will be

1. ± 0.5%
2. ± 1.0%
3. ± 2.5%
4. ± 3.5%

Correct Option: D

If W = U^a/V^b, then
Limiting error (in W)
= a × limiting error in U + b × limiting error in V

R =	P
	I²

∴ Limiting error in measurement of resistance R = limiting error in the measurement of power + 2 × limiting error in the measurement of current = ± (1.5 + 2 × 1) = ± 3.5%