anonymous
  • anonymous
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 = $ _____
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
@Chlorophyll
anonymous
  • anonymous
@zepp
zepp
  • zepp
1 kilowatt is equal to 1000 watts, can you convert the questions into kW?

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More answers

anonymous
  • anonymous
so we got 4,000 watts
anonymous
  • anonymous
and we have to convert them into kw right
zepp
  • zepp
Yes
anonymous
  • anonymous
4,000x1,000
anonymous
  • anonymous
0,004 killowatts
zepp
  • zepp
You are doing this wrong D:\[1\text{kW}=1000\text{W}\\?\text{kW}=4000\text{W}\]
anonymous
  • anonymous
4
anonymous
  • anonymous
killowatt
zepp
  • zepp
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?
anonymous
  • anonymous
40
anonymous
  • anonymous
400
anonymous
  • anonymous
4x10
zepp
  • zepp
40kWh, yes, Tim should pay 4.3 cents per kWh, so how much does he have to pay?
anonymous
  • anonymous
40x4.3
anonymous
  • anonymous
172
zepp
  • zepp
Yep, Tim has to pay 172 cents for running that appliance for 10 hours, you got it! :D
zepp
  • zepp
You have to convert it to $'s though, so 172 cents would be $1.72
anonymous
  • anonymous
so its asking round to the nearest cent. 1.7
zepp
  • zepp
Yes, you got it :)
anonymous
  • anonymous
Round to the nearest CENTs means 2 decimal digits = $1.72
anonymous
  • anonymous
1 kilowatt=1,000 watts 1,500/1,000=1.5 1.5x10=15 15x4.3=64.5
anonymous
  • anonymous
he pays 64.50 right
anonymous
  • anonymous
Yes, $64.50
anonymous
  • anonymous
= 40 w * (4.3 / 1, 000 w hr) * 10 hrs

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