Respuesta :
Answer: a) $1.6123 , b) $0.00588 c) $0.392
Explanation:
Note, all power in watts is converted to kilowatts and all units of time is converted to hours.
The cost of electricity is $0.12 for 1kwh.
Question a.
Power = 40w to kilowatts = 40/1000 = 0.04kw
Time = 2 weeks to hours = 24 * 14 = 336 h.
Energy = power * time.
Energy = 0.04 * 336 = 13.44kwh.
If 1kwh cost $0.12, then 13.44 kwh will cost
0.12 * 13.44 = $1.6132.
Question b
Power = 980w to kilowatts = 980/1000= 0.98kw
Time = 3 minutes to hours = 3/60 = 0.05 h
Energy = power * time
Energy = 0.98 * 0.05
Energy = 0.049kwh
If 1kwh cost $0.12, then 0.049 kwh will cost
0.049 * 0.12 = $0.00588
Question c
Power = 4900w to kilowatts = 4900/1000= 4.9kw.
Time = 40 minutes to hours = 40/ 60 = 0.67.
Energy = power * time
Energy = 4.9 * 0.67
Energy = 3.267 kwh
If 1 kwh cost $0.12, then 3.267kwh will cost
3.268 * 0.12 = $ 0.392
(a) The cost for the porch light is $1.6123
(b) The cost for making the dark toast is $0.00588
(c) The cost for drying the cloaths will be $0.392
Calculating the cost:
Given that the cost of electricity is $0.12 for 1kwh.
(A) Power = 40w = 0.04kw
Time for which it is used = 2 weeks = 24 × 14 = 336 h.
Energy = power × time.
Energy = 0.04 × 336 = 13.44 kwh.
Therefore the total cost is:
0.12 × 13.44 = $1.6132.
(B) Power = 980w = 980/1000= 0.98kw
Time the toaster is used for = 3 minutes = 3/60 = 0.05 h
Energy = power × time
Energy = 0.98 × 0.05
Energy = 0.049kwh
Therefore the total cost is:
0.049 × 0.12 = $0.00588
(C) Power = 4900w = 4900/1000= 4.9kw.
Time = 40 minutes = 40/ 60 = 0.67 hrs
Energy = power × time
Energy = 4.9 × 0.67
Energy = 3.267 kwh
Therefore the total cost is:
3.268 * 0.12 = $ 0.392
Learn more about electrical power:
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