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

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Infinity Learn · Accepted Answer

Since, power rating of bulb in both the countries India and USA should be the same, so∴    $$V12R1$$ $$=V22R2$$⇒   $$220$$  × $$220$$ $$R1$$  $$=$$   $$110$$  × $$110$$ $$R2$$⇒  $$R2R1=$$  $$110220$$ ×  $$110220$$⇒   $$R2$$  $$=$$  $$R4$$     ∵   $$R1=R$$

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

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