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  • Tell me? An electric bulb is rated 220 volt ­ - 100 watt. The power consumed by it when operated on 110 volt will be

An electric bulb is rated 220 volt ­ - 100 watt. The power consumed by it when operated on 110 volt will be

  • Option 1)

    50 watt

  • Option 2)

    75 watt

  • Option 3)

    40 watt

  • Option 4)

    25 watt

 

Answers (2)

best_answer

As we have learned

Power dissipiated in the external circuit -

(\frac{nE}{R+nr})^{2}\cdot R

-

 

 P = \left ( \frac{V}{V_0 } \right )^2 P_0

= \left ( \frac{110}{220} \right )^2 \times 100 W = 25 W

 


Option 1)

50 watt

Option 2)

75 watt

Option 3)

40 watt

Option 4)

25 watt

Posted by

Avinash

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