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Current Electricity question

2004 · Q122
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Current Electricity question

2004 · Q122

NEETPhysicsCurrent ElectricityMCQ+4 / −1
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
  1. A
    R
  2. B
    2R
  3. C
    R/4
  4. D
    R/2
View written solutionFree

Correct answer: C

P=V2RP = {{{V^2}} \over R}P=RV2​

⇒R=V2P=(220)260=4×(110)260 \Rightarrow R = {{{V^2}} \over P} = {{{{\left( {220} \right)}^2}} \over {60}} = {{4 \times {{\left( {110} \right)}^2}} \over {60}}⇒R=PV2​=60(220)2​=604×(110)2​

R′=(110)260=R4R' = {{{{\left( {110} \right)}^2}} \over {60}} = {R \over 4}R′=60(110)2​=4R​

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