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Why are the filament-type electric light...

Why are the filament-type electric light bulbs not power efficient?

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When electric power is supplied to the filament-type electric light bulb, most of the electric power consumed by the filament appears as heat (due to which the bulb becomes hot), only a small amount of electric power is converted into light. So, the filament-type electric light bulbs are not power efficient.
[Note: Tube-lights are much more power efficient because they have no filaments.]
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KUMAR PRAKASHAN-ELECTRICITY-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions as directed (Miscellaneous):)
  1. Name two devices whose working is based on the heating effect of elect...

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  2. Name the gases which are filled into the filament-type electric light ...

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  3. Why are the filament-type electric light bulbs not power efficient?

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  4. Under what conditions is the Ohm.s law applicable?

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  5. Why is Nichrome used as a heating element?

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  6. Why are Constantan and Manganin used for making standard resistors?

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  7. Why is lead-tin alloy used for making a fuse?

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  8. What is the difference between a resistor ~ and resistance?

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  9. What do you mean by the term load in an electric circuit?

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  10. How does the current divide itself in a parallel combination of resist...

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  11. How does the potential difference divide itself in a series combinatio...

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  12. How is heat produced in a conductor by an electric current?

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  13. If a number of bulbs of different wattages are joined in parallel With...

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  14. Which bulb will glow With maximum brightness in case bulbs of differen...

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  15. What can you say about the resistance of an ammeter?

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  16. What can you say about the resistance of a voltmeter?

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  17. How does the resistance of a metallic Wire depend on its temperature?

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  18. Two wires have the same length, same radius but one of them is made of...

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  19. Name a substance whose resistance decreases with temperature.

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  20. Name a substance whose resistance almost remains unchanged With a chan...

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