## anonymous 3 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 = $_____ • This Question is Closed 1. anonymous @Chlorophyll 2. anonymous @zepp 3. zepp 1 kilowatt is equal to 1000 watts, can you convert the questions into kW? 4. anonymous so we got 4,000 watts 5. anonymous and we have to convert them into kw right 6. zepp Yes 7. anonymous 4,000x1,000 8. anonymous 0,004 killowatts 9. zepp You are doing this wrong D:$1\text{kW}=1000\text{W}\\?\text{kW}=4000\text{W}$ 10. anonymous 4 11. anonymous killowatt 12. 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? 13. anonymous 40 14. anonymous 400 15. anonymous 4x10 16. zepp 40kWh, yes, Tim should pay 4.3 cents per kWh, so how much does he have to pay? 17. anonymous 40x4.3 18. anonymous 172 19. zepp Yep, Tim has to pay 172 cents for running that appliance for 10 hours, you got it! :D 20. zepp You have to convert it to$'s though, so 172 cents would be $1.72 21. anonymous so its asking round to the nearest cent. 1.7 22. zepp Yes, you got it :) 23. anonymous Round to the nearest CENTs means 2 decimal digits =$1.72

24. anonymous

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

25. anonymous

he pays 64.50 right

26. anonymous

Yes, \$64.50

27. anonymous

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