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S8_mud

# S8_mud - Lecture S8 Muddiest Points General Comments In...

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Lecture S8 Muddiest Points General Comments In today’s lecture, we began learning about capacitive circuits. We did a concept test that emphasized the rule that capacitors resist voltage change, and began learning how to write the differential equations of circuits with capacitors. We also learned that capacitors can be treated a little like resistors a capacitor has a conductance (more properly called an admittance ), and we can use it just like a conductance when we do the node method. There we only 39 cards today. Please, I would like everyone to particpate in the muddiest-part-of-the-lecture exercise. Responses to Muddiest-Part-of-the-Lecture Cards (39 cards) 1. Stil l don’t understand how to find node equations “by inspection.” (4 students) At any node (say, e 1 ), the left hand side of the node equation is the sum of the conductances touching e 1 times e 1 , minus the conductance connecting e 1 to e 2 times e 2 , minus the conductance connecting e 1 to e 3 times e 3 , . . . The right hand side of the node equation is the sum of current sources ﬂowing into e 1 . (Note: I have assumed that there are no voltage sources attached to e 1 . If there is, either the node voltage is known at e 1 , and there is no need to write KCL at that node, or e 1 is part of a supernode, and the rule is more complicated.) 2. Why is a bandpass filter called a bandpass filter? What does it do? (2) It is common to think about filters in

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S8_mud - Lecture S8 Muddiest Points General Comments In...

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