Question

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 = $ _____

Answer 1

@Chlorophyll

Answer 2

@zepp

Answer 3

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

Answer 4

so we got 4,000 watts

Answer 5

and we have to convert them into kw right

Answer 6

Yes

Answer 7

4,000x1,000

Answer 8

0,004 killowatts

Answer 9

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

Answer 10

4

Answer 11

killowatt

Answer 12

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?

Answer 13

40

Answer 14

400

Answer 15

4x10

Answer 16

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

Answer 17

40x4.3

Answer 18

172

Answer 19

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

Answer 20

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

Answer 21

so its asking round to the nearest cent. 1.7

Answer 22

Yes, you got it :)

Answer 23

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

Answer 24

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

Answer 25

he pays 64.50 right

Answer 26

Yes, $64.50

Answer 27

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