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Explain why, tungsten is used for making...

Explain why, tungsten is used for making the filaments of electric bulbs.

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. (a) Write down the formula for the heat produced when a current I is p...

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  2. Why is an electric light bulb not filled with air? Explain why argon o...

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  3. Explain why, tungsten is used for making the filaments of electric bul...

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  4. Explain why, the current that makes the heater element very hot, only ...

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  5. When a current of 4.0A passes through a certain resistor for 10 minute...

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  6. A heating coil has a resistance of 200 Omega. At what rate will heat b...

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

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  8. A resistance of 25 Omega is connected to a 12V battery. Calculate the ...

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  9. 100 J of heat are produced each second in a 4 Omega resistance. Find t...

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  10. (a) Derive the expression for the heat produced due to a current 'I' f...

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  11. The heat produced by passing an electric current through a fixed resis...

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  12. The current passing through an electric kettle has been doubled. The h...

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  13. What is an electric fuse? How does it function?

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  14. The elements of electrical heating devices are usually made of:

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  15. The heat produced in a wire of resistance 'x' when a current 'y' flows...

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  16. Which of the following characteristic is not suitable for a fuse wire?

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  17. In a filament type light bulb, most of the electric power consumed app...

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  18. Which of the following is the most likely temperature of the filament ...

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  19. If the current flowing through a fixed resistor is halved, the heat pr...

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  20. The electrical resistivities of four materials P,Q,R and S are given b...

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