QQuestion
A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V. Write Yes or No. Give supporting calculations to justify your answer.
✓Answer
Maximum current passing through the fuse (Imax) = 5 A
Input voltage of the geyser (V) = 220 V
Power rating of the geyser (P) = 1540 W
Let, current passing through geyser be I.
Then, P = IV
I = \frac{P}{V} = \frac{1540}{220} = 7 A
As, Imax = 5 A < I = 7 A
So if the fuse is used with the geyser then it will draw more current greater than the maximum current and in turn fuse will melt.
No, the fuse can not be used with the geyser.
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