The cost is about $0.09/kw-h. Calculate the cost of: Leaving a 60 watt porch lig

Question

The cost is about $0.09/kw-h. Calculate the cost of: Leaving a 60 watt porch light 011 for 2 weeks while you are away on vacation. Making a piece of toast in your toaster, if it takes 3 minutes and the toaster has a rating of 900 watts. Drying a load of laundry in your dryer, which is rated at 5,200 watts. It takes 50 minutes for the load to dry. A Chevy Volt uses 8 kW-h to drive 40 miles. How much does this cost, and compare it to a typical gasoline-only car's cost for driving a similar distance. A two-person chair lift at a ski resort can move about 1200 people per hour up the hill. If each person weighs an average of 80 kg, and the elevation of the exit ramp is 400 111 above the loading ramp, what minimum motor rating in kW is required and how much does it cost per hour for the electricity to operate the lift motor?

Explanation / Answer

1.

a) 60 * (2*7*24)*0.09/1000=1.81

b) 900* (3/60)*0.09/1000=0.004

c) 5200*50/60*0.09/1000=0.39

d) 8 * 0.09 = 0.72

a normal care gets about 30 miles a gallon and gas costs $4 a gallon so $4 *4/3 =5.33 dollars

so much cheaper with electric car

c) P = N m gh /t = 1200*80*9.81*400/(1*60*60)=104.6 kW

104.6*0.09= 9.42 dollars

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