Question

19. In a house, five 100 W electric bulbs are lit for6 hours, and a 1500 W electric heater is used for2 hours daily.(a) Calculate the electrical energy consumed in30 days.(b) Calculate the cost if the rate is * 4 per unit.​

Answer 1

changing 100W into K/j=0.1

electric bulb light for 6 hours consume electric =0.1*6=0.6k/j

1500Winto k/j= 3k/j

electric energy consumed in 30 days is (0.6+3)*30 =108k/j

the cost if the rate is 4 per unit

1unit=1k/j

108k/j*4=. rs432.00