1.

The voltage across a lamp, is 6.32V when the current passing through it is 3.4 A. Find the power consumed to appropriate significant figures.

Answer» Voltage across a lamp=6.32 V (3 significant figure)
Current flowing through lamp=3.4 A (2 significant figure)
`therefore` Power consumed, `P=VI=(6.32)(3.4)=21.488 W`
Answer should have minimum number of significant figure. Here, the minimum number of significant figure is 2
`therefore` Power consumed=2 W


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