alexayero
contestada

As you can see, my cousin has a lot of hair. He uses an 1800 W blow dryer and it takes him
three hours to dry his hair. How much does it cost to dry his hair if the cost of electricity in his
town is 15 cents per kilowatt hour?

Please show work if possible!

Respuesta :

unicornetfairies

Power = 1800W (or 1.8KW by dividing by 1000)

Time = 3 hours

Power = energy/ time

1.8KW = energy/ 3

x3

5.4Kw/h= energy

(5.4KJ or 5400J used)

$0.15 Kw/h

$0.15 X 5.4 = 0.81

Thus, cost $0.81

Hope this helps!