Answer to Question #148657 in Physics for seg

Question #148657

It takes 4 minutes to boil a quantity of water electrically, How long will it take to boil same quantity of water using the same heating coil but with the current doubled. Neglect any external heat losses

Expert's answer

"Q=Pt=P't'=I^2Rt=I'^2Rt'\\\\t'=\\frac{I^2}{I'^2}t=\\frac{1^2}{2^2}4=1\\ min"

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