Question

15 bulbs of 60W each runs for 6 hours daily and a refrigerator of 300W runs for 5 hours daily. Work out per day bill at 3 rupees per unit ​

Answer 1

Answer:

18 rupees for the payment of bills

Answer 2

       Per day bill for bulb and refrigerator will be Rs 20.7.

• There is 15 bulb of 60w each.
• So total energy of bulbs=15*60w=900 w
• Change into KW= 900/1000=0.9 KW
• We know E=P*T
• Here time T= 6 hours
• so, E=0.9*6
• so, E=5.4 kwh
• Power consumed by refrigerator = 300 W
• so, change in kw=300/1000=0.3 KW
• Refrigerator runs 5 hours daily so T=5
• So, E=P*T
• So, E=0.3*5
• So, E=1.5 KWH  
• the total energy taken by bulb and refrigerator is =1.5+5.4=6.9 kwh
• So, the bill per day is=6.9*3=Rs 20.7