An electric refrigerator rate 400w is used for 8 hours a day. An electric iron box rated 750 w is used for 2 hours a day. Calculate the cost of using the appliance for 30 days if the cost of 1 kwh is Rs.3/-
Answers
Answer:
electric refrigerator
power consumed = 400W
time used in a month = 30×8 = 240hrs
energy consumed by fridge = power × time
= 400w × 240hrs
= 400/1000 kw × 240hrs
= 96kw
cost of usinf the refrigerator = 96kwh×3
= Rs288
iron box
power = 750w
time used in a month = 30 × 2
= 60hrs
energy consumed by iron box = power × time
= 750w × 60h
= 750/1000 kw × 60
= 45kwh
cost of using the appliance = 45kwh × 3
= Rs135
total amount required = 135 + 288
= Rs423