Converting (having major trouble)

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In summary, the conversation is about converting SI units and determining the cost per joule for a given amount of energy. The initial confusion is cleared up with the understanding that 1 W = 1 J/s and 1 kWh = 3600000 W*s. The cost is then calculated to be 7 cents per 3 600 000 joules, and the task is to determine the cost per joule.
  • #1
BunDa4Th
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I have a link to the image i am having trouble with it is D where i have to convert one SI unit, but really confuse how to do it.

http://img267.imageshack.us/img267/9623/webassignvy9.jpg

any help or explanation on how do the conversion would be very helpful.
 
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  • #2
Okay, I'll get you started. From your responses to the quiz, it is clear that you realize that:

1 W = 1 J/s

Therefore, 1 J = 1 W*s

A joule of energy is the amount of energy expended after one second by something that uses one watt of power.

Therefore

1 kWh = ? W*s

well, how many watts in a kilowatt? How many seconds in an hour? It's really as simple as that!
 
  • #3
1 kWh = (10^3 W)(3600 sec.) = 3600000 W*s

BTW, its not a quiz it's homework given to us to review for the quiz/test.
 
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  • #4
Ok, hw. Cool...

So your answer looks right to me. In which case, if I'm reading your homework right, the cost is 7 cents per 3 600 000 joules = whatever

Let me know if that gives you the right answer!
 
  • #5
7 cent is incorrect which i have tried earlier.
 
  • #6
No no no! It's 7 cents for every kWh = 3600000 J. They want to know what it is on a PER JOULE basis. Now that you have the number of joules in a kWh, you can easily calculate the unit price PER JOULE.

cepheid said:
the cost is 7 cents per 3 600 000 joules = whatever

You were supposed to calculate the "whatever". That is your answer.
 
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