In India electricity is supplied for domestic use at 220 V . It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R , the resistance of a 60 W bulb for use in USA will

Question

In India electricity is supplied for domestic use at 220 V . It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R , the resistance of a 60 W bulb for use in USA will be:NEET 2004

TestHub · Accepted Answer

In India, P 1 ​ = R ( 220 ) 2 ​ In USA P V ​ = R 0 ​ ( 110 ) 2 ​ As P 1 ​ = P V ​ ​ ⇒ R ( 220 ) 2 ​ = R V ​ ( 110 ) 2 ​ ∴ R V ​ = 220 × 220 110 × 110 ​ ⇒ f v = 4 R ​ ​

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