Open the data from Trials I, II, and III. Answer the following questions in Notes on your handheld computer:
Discuss the shape of the temperature graph when you supplied electrical energy to the heat cell with the Genecon. Draw the graph. Does it start to heat right away? What does the slope of the line tell you? Is it the same for fast and slow cranking?
Compare the rate of heating by the Genecon and the batteries. Which heats faster? How can you tell? Are you surprised by the cranking speed it takes to equal what a small battery can do?
Is the amount of cooling significant over the period of 60 seconds?
Is the shape of the graph for cooling the same as the shape for heating? How long would it take for the heat cell to cool down to room temperature?
Could the energy in the battery be called "potential" energy? What form do you think it is in?
Why did the light bulb heat up so much more rapidly than the heat cell?
Compare the tape teams' data with the foil teams' data. Did the bulb heat up faster with the clear tape or the aluminum foil? How does the electricity turn into heat? What difference does the covering make?
