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One kg of water, at 20ºC, heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of 20 Ω . The rms voltage in the mains is 200 V. Ignoring heat loss from the kettle, time taken for water to evaporate fully, is close to : [Specific heat of water = 4200 J/(kg ºC), Latent heat of water = 2260 kJ/kg]

1. 10 minutes
2. 22 minutes
3. 3 minutes
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Correct answer: 22 minutes

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