# Homework Help: Work, Power and Energy

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1. Oct 8, 2015

### ElegantSir

1. The problem statement, all variables and given/known data
"Complete the weekly energy cost and power rating of a TV and clothes dryer by completing the table that follows."

The table is presented in the thumbnail

2. Relevant equations
work = force / distance
power = work / time

Y = E * c
-Y is the yearly running cost
-E in the EnerGuide energy rating per year
-c is the cost of electricity per kW/h

3. The attempt at a solution
Ive done the first 4 columns of the chart and I know how to solve the last one (By using the p = w * t equation) Problem is....I have no idea how to calculate the "estimate of hours of use per week." Ive been multiplying and dividing the number of hours per week by about anything I can think of but Im not coming up with the correct answer. If anyone can point me in a direction as to what I need to be calculating the help would be greatly appreciated!

P.S This table was the answer given to us for the example question. The last 2 columns are unfinished on my personal table

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2. Oct 8, 2015

### Matejxx1

Try getting the estimate of hours per week by using the
E per week and the power calculated in the last row

3. Oct 8, 2015

### ElegantSir

I cant do that because I dont know the power yet. Like I stated The last 2 columns on my chart are empty and i cant calculate power without the time first.