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Heating Effect of Current

An electrical...

Question

An electrical fuse is rated at $2 A$ . What is meant by this statement ? An electric iron of $1 k W$ is operated at $220 V$ . Find which of the following fuses that respectively rated at $1 A, 3 A$ and $5 A$ can be used in it?

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Solution

It means, the maximum current will flow through it is only $2 A$ . Fuse wire will melt if the current exceeds $2 A$ value through it.
Given : $P = 1 k W = 1000 W, V = 220 V$

Current drawn , $I = \frac{P}{V} = \frac{1000}{220} = \frac{50}{11} = 4.54 A$

To run electric iron of $1 k W$ , rated fuse of $5 A$ should be used.

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