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1 year ago

As you can see, my cousin has a lot of hair. He uses an 1800 W blow dryer and it takes him

Physics

1 answer:

maw [93]1 year ago

5 0

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

Time = 3 hours

Power = energy/ time

1.8KW = energy/ 3

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!

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