10. An electrical device has a rating of 300 W. What is the 30-day cost incurred in running it for 5 hours ever day if the cost of electricity is 5 per unit?
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10. An electrical device has a rating of 300 W. What is the 30-day cost incurred in running it for 5 hours ever day if the cost of electricity is 5 per unit?
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Explanation:
Power=300 watt.
Running hours per day= 5 hours
Daily consumption= 5 X 300= 1500 watt hour or 1.5 Kwh
consumption for 30 days = 1.5 Kwh X 30 = 45Kwh
Rate per unit= 5 Rs.
Cost = 45 X 5=225 Rs.
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