A small coaching centre operates the following electrical devices on a typical working day:
• Four LED tube-lights, each rated 20 W, 230 V, used for 8 h
• One ceiling fan rated 70 W, 230 V, used for 10 h
• One electric kettle rated 1500 W, 230 V, used twice a day for 15 min each time
• Three desktop computers, each rated 250 W, 230 V, used for 6 h
Using this information, answer the questions below.
(i) Compute the total electrical energy consumed in one working day in kWh.
(ii) The centre’s electricity supply is protected by a single fuse in series. Determine the minimum current rating that the fuse should safely withstand when all the devices operate simultaneously.
(iii) If the supply company charges a fixed rate of Rs 5.80 per kWh and an additional meter rent of Rs 100 per month, calculate the total electricity bill for 26 working days in that month.
(iv) Suggest one practical measure, based on your calculations, by which the centre can reduce its monthly electricity expenditure, and justify your suggestion quantitatively.