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)

As we learnt in

if R=r -

P_{max}=\frac{E^{2}}{4r}

- wherein

Power delivered will be maximum

 

 R=\frac{v^{2}}{P}=\frac{220^{2}}{100}

P=\frac{110^{2}}{\frac{220^{2}}{100}}=\frac{100}{4}

      =25 w

 


Option 1)

50 watt

This option is incorrect.

Option 2)

75 watt

This option is incorrect.

Option 3)

40 watt

This option is incorrect.

Option 4)

25 watt.

This option is correct.

N neha

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