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# The resistance of a pocket calculator

last edited by 2 years, 10 months ago

8.5.P9

 A typical AA battery delivers a nearly constant voltage of 1.5 V and stores about 104 J of energy. From the time it takes you to use up the batteries in your calculator estimate the resistance of your calculator. (If you don't have a calculator of this type, make a plausible estimate of how long it might take to use up the batteries. Assume thereis 1 AA battery in the calculator. Give some reason for your estimate.) Be sure to clearly state your assumptions and how you came to the numbers you estimated, since grading on this problem will be mostly based on your reasoning, not on your answer. Photo by E. Redish, with permission.

Joe Redish 10/19/02