The cost of electricity varies widely throughout the United States; $0.120/kWh i
ID: 1329614 • Letter: T
Question
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 80.0-W porch light on for 2 weeks while you are on vacation.
(b) Making a piece of dark toast in 3.00 min with a 860-W toaster. (Give your answer to at least three decimal places.)
(c) Drying a load of clothes in 40.0 min in a 4,500 W dryer. (Give your answer to at least one decimal place.)
Please show your work (picture below).
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 80.0-W porch light on for 2 weeks while you are on vacation. your anaswer to at leas (b) Making a piece of dark toast in 3.00 min with a 860-W toaster. (Give your answer to at least three decimal places.) (c) Drying a load of clothes in 40.0 min in a 4,500 W dryer. (Give your answer to at least one decimal place.)Explanation / Answer
here,
(a)
power of porch light , P = 80 W
P = 0.08 KW
time taken , t = 2 week
t = 2 * 14 * 24 hours
t = 672 hours
energy consumption , E = P*t
E = 0.08 * 672
E = 53.76 KWh
cost = E * 0.12
cost = 6.45 dollar
the cost of electricity for porch light is 6.45 dollar
(b)
power of toaster , P = 860 W
P = 0.86 KW
time taken , t = 3 min
t = 3/60
t = 0.05 hours
energy consumption , E = P*t
E = 0.86 * 0.05
E = 0.043 KWh
cost = E * 0.12
cost = 5.16*10^-3 dollar
the cost of electricity for porch light is 5.16*10^-3 dollar
(c)
power of dryer, P = 4500 W
P = 4.5 KW
time taken , t = 40 min
t = 40/60
t = 0.667 hours
energy consumption , E = P*t
E = 4.5 * 0.667
E = 3 KWh
cost = E * 0.12
cost = 0.36 dollar
the cost of electricity for porch light is 0.36 dollar
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