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Unformatted text preview: Lecture S3 Muddiest Points General Comments The were many general questions about the node method. Thats not too surprising I didnt finish explaining the method. We will spend much of Mondays lecture on this, where I hope this will be cleared up. Also, theres still some latent confusion about the sign conventions. Responses to Muddiest-Part-of-the-Lecture Cards (41 cards) 1. General confusion about the node method how it works, where it comes from, why its easier, need mor practice, etc. (12) I will say much more about this at the next lecture. Its easier because the equations are much more organized, and many of the intermediate steps can be eliminated. It works because it embodies Kirchhoff s laws, and the constitutive laws for the circuit elements. And you will definitely get more practice. This is a non-answer answer, but I havent finished the lecturing on this topic yet. 2. Can you explain the node method in more detail. Ive never used it before. (1) Yes, I will do that in lecture Monday. I dont expect that youve seen it before. 3. What is e ? (3 students) Any symbol e ( e 1 , e 2 , etc.) is a node potential. The potential is always measured relative to an arbitrary reference potential (ground) which, by definition, has a potential of zero volts. Potential always has units of volts. 4. I was under the impression that a node was any new branch of a circuit, instead of the connection of several elements. (1) No, a node (or junction) is the common connection of two or more circuit elements (or branches). Some nodes connect to very many elements. That may not have been clear in 8.02, since the circuits there are small. elements....
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- Fall '05