s08_concept

# s08_concept - that I have found the right equation at each...

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Capacitive Circuits Concept Test _ + V C Before the switch is closed, the capacitor is fully discharged. After the switch is closed, 1. Nothing happens 2. The light bulb glows continuously 3. The light bulb glows, then dims 4. The light bulb gradually begins to glow, then glows constantly 5. None of the above 6. Don’t know

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Capacitive Circuits Solution 0 10 20 30 40 1 2 3 4 5 6 Number of Students Answer Lecture S8: Capacitive Circuits The correct answer is Number 3. Before the switch is closed, the capacitor is uncharged, and has 0 V across it. Immediately after the switch is closed, it still has 0 V across it, so the full voltage of the source is across the bulb it glows. As current ﬂows through the bulb, the capacitor is charged, and eventually it reaches the same potential as the source. At that point, no current ﬂows through the bulb, and the bulb dims and goes out.
RC Circuit Equations Concept Test C 1 C 5 R 2 R 3 R 4 e 1 e 2 e 3 For the network above, use the node method, and ﬁnd the equation at each node that results from application of KCL at the node, in terms of the resistor conductances G and capacitor admittances Cs . You should do so without looking at your notes, and “by inspection,” if possible.

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RC Circuit Equations Concept Test C 1 C 5 R 2 R 3 R 4 e 1 e 2 e 3 My conﬁdence

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Unformatted text preview: that I have found the right equation at each node is: 1. 0% 2. 20% 3. 40% 4. 60% 5. 80% 6. 100% RC Circuit Equations Concept Test The correct equations are: ( C 1 s + G 2 ) e 1 G 2 e 2 =0 G 2 e 1 + ( G 2 + G 3 + G 4 ) e 2 G 4 e 3 =0 G 4 e 2 + ( C 5 s + G 4 ) e 3 =0 My answer was 1. Completely correct. 2. Almost completely correct, with one or two small errors. 3. Correct at node e 2 , but incorrect at the other nodes. 4. Had numerous errors. 5. Not on target. RC Circuit Equations Solution 5 10 15 20 25 30 35 40 1 2 3 4 5 Number of Students Answer Lecture S8: RC Circuit Equations (Correctness) The correct equations are found by applying the node method, treating the capacitors as conductances with conductance (admittance, really) Cs . Most of the class had the correct answer. Good!...
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## This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.

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s08_concept - that I have found the right equation at each...

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