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Grade 9 Power Problems (Watts/kWh, power rating question) 
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#1
Jan1611, 07:08 PM

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1. The problem statement, all variables and given/known data
So, i need to learn how to do questions with finding out the power rating, and energy etc etc from using the triangles given and i am having some trouble since some of my triangles are missing and i need some help with converting. 2. Relevant equations 1) A hot plate has a power rating of 1250 Watts. How much energy in Kilowatthours is used when this hot plate is used for 3.00 hours at a banquet? 3. The attempt at a solution I converted the watts to kWh so i turned 1250 to 1.25. On the triangle with the variables of "P," "E," and "T," it says E=Pt So i did 1.25*3 and got 3.75kWh. The problem is that i thought that "E" was always in joules or Kilojoules so i do not think the answer can be 3.75kWh since that is the power rating. If i am correct, i need help with converting the 3.75kWh into joules if that is what i need to do. Thanks !! 


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