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Claire4christ

  • 2 years ago

Can someone help me with this problem please. Tim's electricity costs 4.3 ¢ a kilowatt hour. How much will it cost to run the following appliances for 10 hours? (round to the nearest cent) a) a Dryer @ 4,000 watts. Cost = $ ___ b) a Heater @ 1,500 watts. Cost = $ __ c) a Radio @ 40 watts. Cost = $ _____

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  1. Claire4christ
    • 2 years ago
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    @Chlorophyll

  2. Claire4christ
    • 2 years ago
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    @zepp

  3. zepp
    • 2 years ago
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    1 kilowatt is equal to 1000 watts, can you convert the questions into kW?

  4. Claire4christ
    • 2 years ago
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    so we got 4,000 watts

  5. Claire4christ
    • 2 years ago
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    and we have to convert them into kw right

  6. zepp
    • 2 years ago
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    Yes

  7. Claire4christ
    • 2 years ago
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    4,000x1,000

  8. Claire4christ
    • 2 years ago
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    0,004 killowatts

  9. zepp
    • 2 years ago
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    You are doing this wrong D:\[1\text{kW}=1000\text{W}\\?\text{kW}=4000\text{W}\]

  10. Claire4christ
    • 2 years ago
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    4

  11. Claire4christ
    • 2 years ago
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    killowatt

  12. zepp
    • 2 years ago
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    Yes! Now, this appliance is rated at 4kW, using it for an hour would use 4kWh, how much would it use if it was operating for 10 hours?

  13. Claire4christ
    • 2 years ago
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    40

  14. Claire4christ
    • 2 years ago
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    400

  15. Claire4christ
    • 2 years ago
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    4x10

  16. zepp
    • 2 years ago
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    40kWh, yes, Tim should pay 4.3 cents per kWh, so how much does he have to pay?

  17. Claire4christ
    • 2 years ago
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    40x4.3

  18. Claire4christ
    • 2 years ago
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    172

  19. zepp
    • 2 years ago
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    Yep, Tim has to pay 172 cents for running that appliance for 10 hours, you got it! :D

  20. zepp
    • 2 years ago
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    You have to convert it to $'s though, so 172 cents would be $1.72

  21. Claire4christ
    • 2 years ago
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    so its asking round to the nearest cent. 1.7

  22. zepp
    • 2 years ago
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    Yes, you got it :)

  23. Chlorophyll
    • 2 years ago
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    Round to the nearest CENTs means 2 decimal digits = $1.72

  24. Claire4christ
    • 2 years ago
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    1 kilowatt=1,000 watts 1,500/1,000=1.5 1.5x10=15 15x4.3=64.5

  25. Claire4christ
    • 2 years ago
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    he pays 64.50 right

  26. Chlorophyll
    • 2 years ago
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    Yes, $64.50

  27. Chlorophyll
    • 2 years ago
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    = 40 w * (4.3 / 1, 000 w hr) * 10 hrs

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