1. Which material is used to make the fuse wire. Why?
2. What properties of tungsten make it suitable for being used as a filament in incandescent
lamps.
3. Why is an incandescent lamp filled with an inert gas or nitrogen?
4. Write the advantages of using LED lamps.
5. What are the different ways by which resistors can be connected?
Answers
Answer:
1.The material mainly used for fuse element are tin, lead, silver, copper, zinc, aluminum, and an alloy of lead and tin. The fuse ideally would carry its rated current indefinitely, and melt quickly on a small excess. The element must not be damaged by minor harmless surges of current, and must not oxidize or change its behavior after possibly years of service.
2.Tungsten is used for making filament of an electric bulb due to the following reasons:
-Being an alloy it has a very high melting point.
-It has very high resistivity so it does not burn easily at room temperature.
-The lamp glows at high temperatures
3.Filling a bulb with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum. This allows for greater temperatures and therefore greater efficacy with less reduction in filament life.
4. Long life, Energy efficiency, High brightness and intensity, Low radiated heat
5. Series and parallel
Answer:
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