lecture04

# lecture04 - +-v o + v x -- v y + +-24 V 330 220 100 560...

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EE 205 Coifman 4-1 Homework set #2, due 4/09/08: 2-31, 2-35, 2-39, 2-42, 2-43, 2-46, 2-52, 2-53, 2-56, 2-60

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EE 205 Coifman 4-2 Quick review and bits I may have moved too fast on: Ohm’s law: v=iR -When does this apply? -When does it not apply? Power: p=vi -When does this apply? -When does it not apply? KCL C=current current FLOWS through links currents join/diverge (i.e., adds) at nodes KVL V=voltage voltage is the difference in electric potential between two nodes voltage adds around loops + - + - v A i 2 i 1 R 1 R 2 R 3 i 3 v B v C v S1 v S2 i 4 R 4 D + v O -
EE 205 Coifman 4-3 Okay, so I’m getting the feeling that there is something a little more systematic about this KVL stuff (and you’re showing signs of being a good engineer) The first fancy trick we exploit is voltage division, e.g., find v 1 , v 2 and v 3 in the following circuit: + - v 2 + - v S R 2 R 1 Loop + v 1 - i - v 3 + + R 3 -

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EE 205 Coifman 4-4 Find v x and v y in the following circuit:

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Unformatted text preview: +-v o + v x -- v y + +-24 V 330 220 100 560 (hey, there are only so many simple circuits in the world) EE 205 Coifman 4-5 And what about that KCL stuff, again I think theres something up This time, its current division, e.g., find i 1 , i 2 and i 3 in the following circuit: i S i 1 R 1 R 2 R 3 i 2 i 3 + v-A EE 205 Coifman 4-6 Find i z in the following circuit: 5A 15 20 5 5 i x i y i z (not exactly the one in the book this time) EE 205 Coifman 4-7 Im telling you, these things are just tools. Use voltage division and/or current division to find v x 1 1 1 1.5 +-v x 5 A EE 205 Coifman 4-8 Now take a stab at using voltage division and/or current division to find i x 100 V +-i x 60 30 28 20...
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## lecture04 - +-v o + v x -- v y + +-24 V 330 220 100 560...

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