An electric kettle need 6 minutes to boil 2kg of water from the initial temperature of 20 degrees. The cost of electrical energy required for this operation is 12 pesos, the rate being 40 pesos per kwh. Find the kW rating and the overall efficiency of the kettle.

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Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.