Questions
An electric bulb is rated 220 volt -100 watt. The power consumed by it when operated on 110 volt will be
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a
75 watt
b
40 watt
c
25 watt
d
50 watt
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Correct option is C
R=Vrated 2Prated =220×220100=484 ohm Power consumed at 110V=110×110484=25 WPower is voltage squared over resistance, or P= V2R. Likewise, resistance is voltage squared over power.Similar Questions
There is formation of in all five nodes (including terminal nodes) in a string of 12 cm. Thus, wavelength of the waves formed is
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