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Caution! You will be making cookies!
In this lab I am hoping that you will be able to know how much it costs per cookie that you bake and how many kW it takes to heat an oven.
First things first, make sure you have the following materials ready:
| 1. Cookies!!! |
|---|
| 2. Cookie Sheet |
| 3. Foil to place on cookie sheet |
| 4. Soap to wash your hands *You may use the sink* |
| 5. Cooking Mittens to pull out the cookies when there done |
| 6. Something to write on and with. And I'm assuming you have a computer to follow my directions |
| 7. A smile, you can't make the best cookies with a frown :) - Ella (: |
Next, click onto the light blue link labeled "Click Me!" this link will take you to a server called elab2
Elab2 is a server that will give you the kW (kilo Watts) \ automatically, as long as you can read a graph!
This server monitors the whole elab and all of its energy that flows every second of every day.
*To log on to this website you will need to ask your teacher for assistance they will provide you with the password and username*
If you haven't already, you may click the link.
Once you have clicked the link, look for 'Elab Telemetry', click on that.
Then go ahead and look for 'Energy Used'
That will take you to this chart looking thing below
If you see this you are doing great. If you don't please check your work and try again :)
Now that you have the chart in front of you, you see the different panels there labeled "apanel1-cpanel3"
This is a mystery. Which one will give you the correct kW?
Its time to go downstairs and look for the solar powered oven, and preheat it to the temperature in which the cookie dough tells you to.
HINT!
It may be solar powered but its not outside, and it looks like this.
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Next go back onto the elab2 server and start clicking on the little boxes next to the labeled panels you might want to go one by one now to get confused.
After you choose one of the panels by clicking the little box on the far right press 'graph' on the top of that column.
Do you see a big spike in energy, at which the time matches the time you started to preheat the oven?
If not try another one, until you have found it.
Once you find it, find the difference from before you turned the oven on preheat until the graph then reached its peak as it started to preheat.
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Now i'm hoping that you see the spike and have found how many kW's it takes for that oven to be on.
Now you may start the steps below.
| Step one: Find all of your variables. kW, minutes to bake cookies, cost per kWh, number of cookies you roll And start rolling your cookies they can be as big as you want just make sure that you can make at least 12. |
| Step two: Put your variables in any order you would like. However many cookies that you made count as a variable. *except next to your minutes your going to need to divide that by 60 and you must divide the cost per kWh by 1 kWh to cancel out the label* |
$.40 is the cost per kWh on the Island of Hawaii!
Time to do the work!First make sure you have your equation set up. My variables are made up!
$.40 ÷ 1 kWh • 12 minutes ÷ 60 minutes • 20 cookies = $ /per cookie
Do your division to figure out the simple equation.
$.40 ÷ 1 kWh = $.4
12 ÷ 60 = .2
Then go from left to right and multiply everything together.
$.4 • .2 • 20 = $ /per cookie
It costs $1.60 to bake one cookie.
Your math should come out to a small number of about 0.016 or so.
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