An electric heater is marked "1.5kW,230V" and contains a coil of nichrome wire.
(i) Calculate the current drawn by the heater when it is connected to the mains supply.
(ii) How much electrical energy is converted into heat in 20min of continuous operation?
(iii) If the cost of electrical energy is Rs. 7.50 per kilowatt–hour, find the cost of using this heater for 6 hours every day for 30 days.