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Why are filaments of incandescent lamps ...

Why are filaments of incandescent lamps made of thin tungsten wire ?

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Tungsten has high melting point.
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The resistance of an incandescent lamp is

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Determine the surface area of the filament of a 100W incandescent lamp radiating out its labelled power at 3000K. Given sigam = 5.7 xx 10^(-8)Wm^(-2)K^(-4) , and emissivity epsilon of the material of the filament = 0.3.

Explain the following : (a) Why is tungsten used almost axclusively for filament of incandescent lamp ? (b) Why are the conductors of electric heating devices, such as toaster 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 cross-sectional area ? (e ) Why are copper and aluminimum wires usually employed for electricity transmission.

Incandescent Electric Lamp

What will be the surface area of a filament of 200 W incandescent lamp at 2000 K. sigma = 5.67 xx 10^(-8) Wm^(-2) K^(-4) and emissivity e = 0.3?

PRADEEP-ELECTRICITY-(Additional)Very Short Answer
  1. Is drift speed of electrons in a conductor carrying current the same a...

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  2. What sets the electrons into motion in an electric circuit ?

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  3. Why are filaments of incandescent lamps made of thin tungsten wire ?

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  4. Which are the metals that are generally used : (i) in electric circu...

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  5. Graphs between electric current and potential difference across two co...

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  6. Why is resistance more in series combination of resistors ?

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  7. Why is resistance less in parallel combination of resistors ?

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  8. How will you join three resistances, each of 2 Omega so that the effec...

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  9. On what factors does the resistivity of a material depend ?

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  10. What happens to the current in a circuit if its resistance is doubled ...

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  11. What happens to the resistance of a circuit if the current through it ...

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  12. What happens it the pd across a resistance is doubled ?

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  13. How does the resistance of a wire depend upon its radius ?

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  14. How does the resistance of a wire depend on its length ?

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  15. How does the resistance of a metallic wire depend on its temperature ?

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  16. Two wires are of the same length, same radius, but one of them is of t...

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  17. Find the potential difference required to pass a current of 0.2 A in a...

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  18. An electric bulbs draws 1.2 A current at 6.0 V. Find the resistance of...

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  19. Which will have a higher resistivity : a conductor or an insulator ?

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  20. Two wires of same material and same length have radii r1 and r2 respec...

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