Question

04. Give reasons

(iii) The burnt out fuse should be replaced by another fuse of identical
rating.
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Answer 1

ANSWER:

Fuse is a safety device having short length of thin wire made of tin (25%) and lead (75%)alloy having low melting point around 200°C. It is an important component of all domestic circuits. A fuse in a circuit prevents damage to the appliances and the circuit due to overloading and short-circuiting. The use of an electric fuse prevents the electric circuit and the appliance from a possible damage by stopping the flow of unduly high electric current. The fuse is placed in series with the device. A fuse wire works because of its lower melting point which is possible. If a fuse with larger rating is used with an appliance, the fuse wire shall not melt and hence would fail to serve the required purpose. Due to this, a fuse with defined rating should not be replaced by one with a larger rating.

Answer 2

Answer:

because if we change the ratings of wire the bulb will not glow as bulb is taken according tu the power of wire

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