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By Dietz P.H.

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D. in Electrical Engineering, you should be warned that a favorite qualifying exam question involves these equivalent circuits. You are given two identical looking boxes with two terminals sticking out. One box contains the Thevenin circuit with a one volt source and a one ohm resistor. The other box contains the Norton circuit, made with a one amp current source, and a one ohm resistor. How can you tell which is which? The answer: you can’t tell electrically. However, the Norton box has power dissipating in the resistor.

Lights and Switches We can use this wonderful little circuit with the Stamp. Any of the 16 I/O pins can serve as a voltage source which can be programmed to deliver either 0V or 5V using the “high” and “low” commands. Of course, these pins are not ideal voltage sources, but at these current levels, they will be quite adequate. ) Before you can wire this up in the lab, you need to know a little bit more about the components. Typically, LEDs have two leads, one longer than the other, and one side of the case is flattened slightly.

Imagine for a moment that V2 was set to 0V. A voltage A Pragmatic Introduction to the Art of Electrical Engineering 31 Maybe source of 0V is essentially a wire, so we may now consider R2 and R3 to be in parallel. In fact, this is exactly the same problem we solved earlier. The voltage is: R3R2 V = V1 ------------------------------------------------------R3R2 + R3R1 + R1R2 This suggests a general technique. A circuit with multiple independent voltage sources can be solved by considering the effect of each voltage source independently, and then adding the solutions together.

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