Question

Suppose you have have a 1100 W toaster. a)  How much electrical energy in J is needed...

Suppose you have have a 1100 W toaster.

a)  How much electrical energy in J is needed to make a slice of toast (cooking time = 1 minute)?

b) At 11.5 cents/kWh, how many cents does this cost?

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Answer #1

a)

Power=1100 W

time = 60 s

Electrical energy =Power * time

                         =1100*60=66000 J

b) Convert energy to kWhr (kilo 1000    hr= 60*60 =3600 kilo- hr= )

        1 joule =(1/3600000)kWhr

     66000J=0.018 kwhr

       Cent required= 0.018*11.65=0.21 cent

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