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Why is the tungsten used almost exclusiv...

Why is the tungsten used almost exclusively for filament of electric lamps?

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Because tungsten is a metal of very high melting point and it does not oxidise even at high temperature.
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Explain the following. a] Why is tungsten used almost exclusively for filament of electric lamps? b] Why are the conductors of electric heating devices, such as bread-toasters and electric irons made of an alloy rather than a pure metal? c] Why is the series arrangement not used for domestic circuits? d] How does the resistance of a wire vary with its area of cross-section? e] Why are copper and aluminum wires usually employed for electricity transmission?

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Mention the name of one metal in each of the following: (i) A metal foil used for packing of medicine tablets. (ii) A metal used for galvanizing iron (iii) A metal used almost extensively for making filament of electric bulbs

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OSWAAL PUBLICATION-ELECTRICITY-Textbook Exercises
  1. An electric bulb is rated 220 V and 100 W. When it is operated on I 10...

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  2. Two conducting wires of the same material and of equal. lengths and eq...

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  3. How is a voltmeter connected in the circuit to measure the potential d...

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  5. The values of current I flowing in a given resistor for the correspond...

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  6. When a 12 V battery is connected across an unknown resistor there is a...

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  7. A battery of 9V is connected in series with resistors of 0.2Omega,3Ome...

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  8. How many 176Omega resistors (in parallel) are required to carry 5A on ...

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  9. Show how you would connect three resistors, each of resistance 6Omega ...

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  10. Several electric bulbs designed to be used on a 220 V electric supply ...

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  11. A hot plate of an electric oven connected to a 220 V line has two resi...

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  12. Compare the power used in the 2 Omega resistor in each of the followi...

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  13. Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are ...

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  14. Which uses more energy, a 250 W TV set in 1 hr or a 1200 W toaster in...

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  15. An electric heater of resistance 8 Omega draws 15 A from the service m...

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  16. Why is the tungsten used almost exclusively for filament of electric l...

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  17. Why are the conductors of electric heating devices, such as bread-toas...

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  18. Why is the series arrangement not used for domestic circuits ?

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  19. How does the resistance of a wire vary with its, area of cross-section...

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  20. Why are copper and aluminium wires usually employed for electricity tr...

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