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 = $ _____

- anonymous

- katieb

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- anonymous

@Chlorophyll

- anonymous

@zepp

- zepp

1 kilowatt is equal to 1000 watts, can you convert the questions into kW?

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## More answers

- anonymous

so we got 4,000 watts

- anonymous

and we have to convert them into kw right

- zepp

Yes

- anonymous

4,000x1,000

- anonymous

0,004 killowatts

- zepp

You are doing this wrong D:\[1\text{kW}=1000\text{W}\\?\text{kW}=4000\text{W}\]

- anonymous

4

- anonymous

killowatt

- 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

40

- anonymous

400

- anonymous

4x10

- zepp

40kWh, yes, Tim should pay 4.3 cents per kWh, so how much does he have to pay?

- anonymous

40x4.3

- anonymous

172

- zepp

Yep, Tim has to pay 172 cents for running that appliance for 10 hours, you got it! :D

- zepp

You have to convert it to $'s though, so 172 cents would be $1.72

- anonymous

so its asking round to the nearest cent. 1.7

- zepp

Yes, you got it :)

- anonymous

Round to the nearest CENTs means 2 decimal digits
= $1.72

- anonymous

1 kilowatt=1,000 watts
1,500/1,000=1.5
1.5x10=15
15x4.3=64.5

- anonymous

he pays 64.50 right

- anonymous

Yes, $64.50

- anonymous

= 40 w * (4.3 / 1, 000 w hr) * 10 hrs

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