Question

A . State the function of a fuse in a circuit. How is it connected in the domestic circuit?
B . An electric fuse of rating 3A is connected in a circuit in which an electric iron of power
is connected which operates at 220 V What would happen? Explain.
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Answer 1

Answer:

The over usage of electricity in a circuit more than its limit is called overload.

In other words, the rising of electric load in a circuit is called overload.

The connection of many electric wires to a single socket is called short circuit.

The function of fuse in these situations is to cut off the rising load. In this situation, the fuse wire which is low in electrical resistance, melts due to rising current and breaks the circuit.

Power= VI

Power = 1kW = 1000 W

I = p /v= 1000/220 = 4.54 A

So the fuse will melt and break down the current.

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