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Engineering
Electrical Engineering
Circuitry Basics: Understanding Electric Potential Difference and Voltage
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[QUOTE="Dale, post: 5397947, member: 43978"] It sounds like your professor had the right approach. There are three different theories of electromagnetism. The most general is quantum electrodynamics. It covers all known EM behavior. One useful simplification is Maxwells equations, which applies in the classical limit. A further simplification is circuit theory, which applies in the small circuit and lumped element limit. There is no need to bring QED into a circuits class. I agree with keeping the material separate. In the appropriate limit they are the same thing, but the important thing for circuits is KVL and KCL rather than Coulomb's law. If you solve Maxwells equations you will find that there is a field, but all of the added complexity is unnecessary. In circuit theory the important thing is how the voltage is related to the current at the terminals. What goes on inside the terminals is a topic for a class on Maxwells equations or QED. [/QUOTE]
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Circuitry Basics: Understanding Electric Potential Difference and Voltage
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