An electric kettle has two heating coils. when one coil is used, water in the kettle boils in 5 minutes, while when second coil is used, same water boils in 10 minutes. If the two coils, connected in parallel are used simultaneously.the same water will boil in time
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When the coils are connected in parallel, the effective resistance is, `R' = (R_(1)R_(2))/(R_(1)+R_(2)) = (2R_(2) xx R_(2))/(2R_(2)+R_(2)) = 2/3 R_(2)` `:. ((2//3)R_(2))/R_(2) = (t')/3 or t'= 2` minutes
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