Question

solve questions no 5 and 6

Answer 1

1. Fuse wire is made of a tin-lead alloy and not copper because of the following reasons: 1. They have high resistance due to high resistance the wire heats up quickly, when large current flows. ... They have low melting point which melts and breaks off the circuit if the current is larger than the safety limit.
2. An incandescent lamp works through running a very high current through a metal filament (usually tungsten due to its high melting temperature). Essentially, you heat up the metal filament so hot that it glows. Heat comes from the fact that the filament has a finite resistance.
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Answer 2

5. bcause it is a good conductor of electricity
6. Different types of the filaments are used in the bulb and here, you are probably questioning about incandancent lamp.

The only reason behind the filament being red hot is the high resistance offered by the material used in filament

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