The cost of energy delivered to residences by electrical transmission varies fro

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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