what is the resistance of a heating element assuming the heat capacity to be 4.2kj/kg. voltage 230

An electric kettle is required to heat 0.5kg of water from 10 degrees celcius to boiling point in 5 minutes. The supply voltage is 230V. If the efficiency of kettle is 0.80, calculate the resistance of the heating element. Assume the specific heat capacity of water to be 4.2kj/kg.
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