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Explain the following. (a) Why is the t...

Explain the following.
(a) Why is the 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 aluminium wires usually employed for electricity transmission?

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NCERT TELUGU-ELECTRICITY-EXERCISES
  1. A piece of wire of resistance R is cut into five equal parts. These pa...

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  2. Which of the following terms does not represent electrical power in a ...

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  3. An electric bulb is rated 220 V and 100 W. When it is operated on 110 ...

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  4. Two conducting wires of the same material and of equal lengths and equ...

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

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  6. A copper wire has diameter 0.5 mm and resistivity of 1.6 xx 10^(–8) O...

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

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

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  9. A battery of 9 V is connected in series with resistors of 0.2 Omega, 0...

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

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

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

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

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

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

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

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

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  18. Explain the following. (a) Why is the tungsten used almost exclusivel...

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