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... I don't know who Dr. Bob Beichner is, but he is wrong headed to approach
Ohm's law in this way. He must feel that light bulbs are to Ohm's law as
the orbit of Mercury is to Newton's law: corrections can be made later,
as they are needed, and as the student grows more sophisticated. Well, I
couldn't disagree with him more. The use of light bulbs to illustrate
Ohm's law is the sort of thing that gives "conceptual physics" a bad
reputation. No student will ever believe the lie that two bulbs in series
produce half the light of a single bulb connected to the same source. If
she does, she is not yet ready for physics. If she doesn't, she will look
elsewhere for enlightenment.