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An understanding of Ohm's Law is the basis for understanding circuits. This law is simply a statement that in order to increase the current passing through a device the voltage driving the current must increase proportionally. The constant of proportionality is called the resistance. While this is a good approximation of real circuits, in many cases it fails to consider devices like incandescent lamps and semi conductor devices like diodes, which have an explicitly non linear relationship between current and voltage. This leaves aside considerations of the temperature coefficient of resistivity, which forms the operating basis of the electrical thermocouples, and the strange behavior of resistance at very low temperatures giving us super conductors.
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