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An electric kettle has two coils of same...

An electric kettle has two coils of same power . When one coil is switched on , it takes `15 min` to boil water , and when the second coil is switched on , it takes `30 min`. How long will it take to boil water when both the coils are used in `i`. Series and `ii`. parallel?

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To solve the problem, we will analyze the heating effect of current in both series and parallel configurations of the two coils. ### Given Data: - Coil 1 (R1): Takes 15 minutes to boil water. - Coil 2 (R2): Takes 30 minutes to boil water. ### Step 1: Determine the Heat Supplied by Each Coil The heat supplied by a coil can be expressed as: ...
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