Questions
If a given volume of water in a 220 V heater is boiled in 5 min, then how much time will it take for the same volume of water in a 110 V heater to be boiled?
detailed solution
Correct option is A
H = V2t/R. When voltage is halved, the heat becomes one-fourth. Hence, time taken to heat the water becomes four times.Talk to our academic expert!
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Permissible current through a fuse wire of diameter 1 mm is 1A. What should be the radius of a fuse wire, made of same material, whose permissible current is 8A ?
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