Questions
In India electricity is supplied for domestic use at 220V. 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 :
detailed solution
Correct option is B
RAB=ρl2π2r2=ρl8πr2, RBC=ρl2πr2=ρl2πr2⇒RBC=4 RABBoth are connected in series so VBC=4 VABAlso, PBCPAB=I2RBCI2RAB=4Talk to our academic expert!
Similar Questions
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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