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Q. For my science project I need to figure out how much energy the large elec. element on our stovetop uses when boiling water on high for ten minutes. Any help would be greatly appreciated.
-gtollefson, newport RI, RI
A. Believe it or not, it depends on the shape of the pan and conductivity of the pan material. According to the American Council for an Energy-Efficient Economy, "The ideal pan has a slightly concave bottom — when it heats up, the metal expands and the bottom flattens out. An electric element is significantly less efficient if the pan does not have good contact with the element. For example, boiling water for pasta could use 50% more energy on a cheap, warped-bottom pan compared to a flat-bottom pan." Furthermore, "Certain materials also work better than others and usually result in more evenly cooked food. For instance, copper-bottom pans heat up faster than regular pans." Good luck with your project!
 
Q. Can you tell me how many underground conduits should be run to a gas station fuel tank? I installed two per tank but I am not sure if that's enough. Thank you.
-Tom, Chicago, IL
A. Hi Tom, In this case, you'll need to contact your local authority having jurisdiction on such codes. I suggest beginning with the Illinois EPA: http://www.epa.state.il.us/.
 
 
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