Question

In a house 5 bulbs of 40 watts each 3 bulbs of 100 watts each 4 fans of 80 watt each and 1 heater of 1kilo-wattvare in use.If bulbs are used for 2 hours in a day and voltages of electric mains is 220 volts then find: (1) Maximum current from electric mains. (2) Expenditure of electrical energy at the rate of Rs 4 per unit for one week.

Answer 1

Answer:

Bulb Rating = 40 W = .04 kW

Bulb illuminates for = 10hrs/day

Bulb consumes units( kWH)/day= .04×10= .4 kWH/ day = .4 units/ day

In 30 days = .4×30 = 12 units

1 unit cost = 250/-

12 units cost = 250×12 = 3000/-