problem: a drilling machine operates with an electric power consumption of 840 W. How much does it cost to operate the machine continuously for 8 hours if the elctricity costs $0.080/kwh?
thanx. i need ur help.
electric power?
2007-03-25 2:48 pm
回答 (4)
2007-03-25 2:50 pm
✔ 最佳答案
Energy (E) is power (P) times time (t)E=P t
Cost = E (rate)
Cost = P t rate
Cost=840 x 8 hours (0.080/kwh) (1/1000)
Cost=$.537
2007-03-25 9:18 pm
You just multiply the power consumed in kilowatts (.84kw) times the hours it's consumed (8), and that times the cost in dollars per kwh($.08)
2007-03-25 3:40 pm
What's the tax rate? Does the electricity cost include delivery cost charged by the grid operator? :)
2007-03-25 2:53 pm
This is fairly straight forward. Find the total energy used : multiply the power X how long is was used.
Since you are paying by the kilowatt hour and kilowatts are thousands., divide by 1000 and then multiply by the cost of a kilowatt hour.
Since you are paying by the kilowatt hour and kilowatts are thousands., divide by 1000 and then multiply by the cost of a kilowatt hour.
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