a) Though same current flows through the electric line wires and the filament of bulb,
yet only the filament glows. Why?
(b)The temperature of the filament of bulb is 2700°C when it glows. Why does it not get
burnt up at such high temperature?
(c)The filament of an electric lamp which draws a current of 0.25 A is used for four hours.
Calculate the amount of charge flowing through the circuit.
(d) An electric iron is rated 2 kW at 220 V. Calculate the capacity of the fuse that should be
used for the electric iron.
(e) Copper wires are used in transmission lines. Why?
Answers
Answered by
2
Answer:
a... Because filament is made of a special material named tungesten which glows when electricity is passes through it
Answered by
8
Answer:
a)
this is because filament is made up of tungsten which has more resistance to the flow of electricity as compared to the wires of electric line that are made up of copper ie. material with less resistance to flow of electricity. due to this resistance the filament heats up and starts glowing.
b)
anything burns when it reacts with oxygen and gets oxidised. but the bulbs are filled with some inert gas which do not react with the material of filament ie. tungsten and it doesn't get burnt up
c)
copper is used in transmission lines due to it's low resistance to electric current and cheaper price
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