Between 6:00 a.m. and 7:00 a.m., a house uses three appliances:
(a) a room heater rated 1.5kW operated from 6:00 a.m. to 6:45 a.m.;
(b) a mixer-grinder rated 0.5kW operated from 6:30 a.m. to 6:40 a.m.;
(c) four LED lamps each rated 15W operated from 6:00 a.m. to 7:00 a.m.
a. (i) Find the maximum power demand (peak load) during this interval, in kW.
b. (ii) Calculate the total electrical energy consumed between 6:00 a.m. and 7:00 a.m., in kWh.