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?
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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