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An electric refrigerator rated 400 W is used for 8 hours a day. An electric ironbox rated 750 W is used for 2 hours a day. Calculate the cost of using theseappliances 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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