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Unformatted text preview: Lecture S2 Muddiest Points General Comments There’s still considerable confusion about the sign conventions we are using. Bear with me — I hope it will make sense as we proceed. Responses to Muddiest-Part-of-the-Lecture Cards (44 cards) 1. General confusion about sign conventions, including the sign convention concept test. (11 students) Many students are still confused by sign conventions. Many of the questions were non-specific. A couple of folks thought I could have spent more time on the concept test, and they’re probably right. I will repeat the arguments I made in class, and in the last muddy card responses. The first comment is the sign convention is, well, a convention, which means that we all label things the same way because we agree to label things the same way. The second point is that the convention is useful because it is consistent, although it may not appear to be so yet. By always using the passive sign convention, we can always tell which elements absorb or dissipate power, and which supply power. 2. On one example, you label the current going through the element, and in another, you label the current going out of the element. Which is it? [The picture shows one case where the current is drawn right next to the element, and another picture shows the current ﬂowing through the wire coming out of the element.] (1) Both. The current ﬂowing through the element is exactly the same as Both....
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- Fall '05
- Electric charge, conservation law, current flows, Aloop