the cost of electricity varies widely throughout the united states; $0.120/kwh is a typical value. at this unit price, calculate the cost of the following.(a) leaving a 40.0-w porch light on for 2 weeks while you are on vacation.$ 1.61 correct: your answer is correct.(b) making a piece of dark toast in 3.00 min with a 940-w toaster. (give your answer to at least three decimal places.)0.00564 incorrect: your answer is incorrect. ¢(c) drying a load of clothes in 40.0 min in a 5,000 w dryer. (give your answer to at least one decimal place.)

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akankshasharma92 akankshasharma92 · Answer 1 · 2022-10-14T18:00:14+02:00

The cost for the porch light is $1.6123, The cost for making the dark toast is $0.00588, The cost for drying the cloths will be $0.392.

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 = 940w = 940/1000= 0.94kw

Time the toaster is used for = 3 minutes = 3/60 = 0.05 h

Energy = power × time

Energy = 0.94 × 0.05

Energy = 0.047kwh

Therefore the total cost is:

0.047 × 0.12 = $0.00564

c) Power = 5000w = 5000/1000= 5.0 kw.

Time = 40 minutes = 40/ 60 = 0.67 hrs

Energy = power × time

Energy = 5.0 × 0.67

Energy = 3.35 kwh

Therefore the total cost is:

3.35 × 0.12 = $ 0.402

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