The cost of electricity varies widely throughout the UnitedStates; $0.120/kWh is

Question

The cost of electricity varies widely throughout the UnitedStates; $0.120/kWh is a typical value. At this unit price,calculate the cost that would result from each of thefollowing.

(a) Leaving a 100.0 Wporch light on for 2 weeks while you are on vacation.
$ 1__________
(b) Making a piece of dark toast in 3.00 min with a 990 W toaster.
$ 2__________
(c) Drying a load of clothes in 40.0 min in a 4700 W dryer.
$ 3__________
The cost of electricity varies widely throughout the UnitedStates; $0.120/kWh is a typical value. At this unit price,calculate the cost that would result from each of thefollowing.

(a) Leaving a 100.0 Wporch light on for 2 weeks while you are on vacation.
$ 1__________
(b) Making a piece of dark toast in 3.00 min with a 990 W toaster.
$ 2__________
(c) Drying a load of clothes in 40.0 min in a 4700 W dryer.
$ 3__________

Explanation / Answer

a) 2 weeks = 24 hrs/day * 14 days = 336 hours 100W = .1kW .1kW for one hour equals .1kWh .1kWh * 336h = 33.6kWh $.12 * 33.6 = $4.03 b) 3min * (1hr / 60min) = 1/20hr 990W = .99kW .99kW * (1/20hr) = .0495kWh $.12 * .0495 = $.006 c) 40min * (1hr/60min) = 2/3hr 4700W = 4.7kW 4.7kW * (2/3hr) = 3.13kWh $.12 * 3.13 = $.38

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