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

Question

The cost of electricity varies widely throughout the United States;$0.120/kWh is a typical value. At this unit price, calculate thecost that would result from each of the following:
(a) leaving a 40.0W porch 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 4600 W dryer
$ 3
(a) leaving a 40.0W porch 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 4600 W dryer
$ 3

Explanation / Answer

money=0,12*kWh. a) money=0,12*40e-3kW*336h=$1,61 b) money=0,12*990e-3*3/60 h=0,06 (dollar) c). money=0,12*4,6kW*40/60h=0,368(dollar)

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