The cost of energy delivered to residences by electrical transmission varies fro
ID: 1541185 • Letter: T
Question
The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value. (a) At this average price, calculate the cost of leaving a 75-W porch light on for two weeks while you are on vacation? $ 1.54 Incorrect: Your answer is incorrect. Your response differs from the correct answer by more than 10%. Double check your calculations. (b) At this average price, calculate the cost of making a piece of dark toast in 3.00 min with a 935-W toaster? $ (c) At this average price, calculate the cost of drying a load of clothes in 40.0 min in a 5.00 103-W dryer?
Explanation / Answer
a)
75-W porch light
75 x 24 x 14 = 25200 W = 25.2 kw
cost = 25.2 x 0.110 = 2.772$
b)
dark toast
[3 / (60)] x 935 = 0.04675 kWh
cost = 0.04675 x 0.110 = 0.005143$
c)
[40/ (60)] x 5 kW = 3.333 KWh
cost = 3.333 x 0.110 = 0.3666$
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