An electric kettle is rated 1.5kW and is connected to a household supply that remains constant at its rated voltage. Solve the following:
a. (i) Calculate the electrical energy consumed when the kettle operates continuously for 12min.
b. (ii) Express the answer obtained in part (i) in kilowatt-hour.
c. (iii) If only 0.25kWh of electrical energy is available, determine the maximum continuous time for which the kettle can be used at its rated power.