An electric refrigerator rated 400 W 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 these
appliances for 30 days, if the cost of 1 kWh is Rs. 3/-.
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Answer:
energy for one day
=(400×8)/1000+(750×2)/1000
=(3200+1500)/1000
=47 KWH
energy for 30 days
=30×47
=1410 KWH
cost=1410×3=₹4230
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