A 750 W, 230 V electric iron is used for a continuous period of 30 minutes.
(i) Calculate the current drawn by the iron from the mains.
(ii) Determine the heat produced in the heating element during this interval in (a) joule and (b) calorie. Use 1cal=4.2J.
(iii) How much electrical energy, in kilowatt-hour (kWh), is consumed in this operation?