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A 220V-500W aluminium electric kettle we...

A 220V-500W aluminium electric kettle weighing 1.2kg is used to boil water from a 180V supply. How long will it take 1kg of water from `30^(@)C "to" 100^(@)C`? (Relative heat heat capacity of aluminimum =0.3)

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NN GHOSH-HEATING AND CHEMICAL EFFECT OF CURRENT-EXAMPLE B
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