Haken ECE 110 Handout 1

# Haken ECE 110 Handout 1 - ECE 110 Transparencies Set 1 for...

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L Haken ECE110 transparencies – set 1 page 1 ECE 110 Transparencies Set 1 for Noon Lectures Prof. Lippold Haken Circuit Nodes. ................................................................................... 2 Kirchhoff Voltage Law (KVL). ....................................................... 3 Kirchhoff Current Law (KCL). ...................................................... 6 Symbols for Linear Circuit Elements . ......................................... 13 Equivalent Circuits. ....................................................................... 14 Voltage Divider Rule. ..................................................................... 23 Current Divider Rule. .................................................................... 26 IV Characteristics. ......................................................................... 29 Polarity, Overlaid IV Graphs . ...................................................... 33 The Semiconductor Diode. ............................................................ 35 Photodetector Diodes. .................................................................... 42 Zener Diodes. .................................................................................. 43 Large Signal Diode Circuits. ......................................................... 45 These transparencies include material by Prof. Marie-Christine Brunet and Prof. Tim Trick

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L Haken ECE110 transparencies – set 1 page 2 Circuit Nodes A node is all points connected by wire. How many nodes in these circuits? Circle each node.
L Haken ECE110 transparencies – set 1 page 3 Kirchhoff Voltage Law (KVL) (The same can be said about elevation changes on a topographic map. Circuit nodes are like flat spots on the map; voltage drops or rises at circuit elements are like elevation changes down or up on the map.) Begin by labeling the nodes with A, B, C. Then solve the equation: V AB + V BC + V CA = 0 In any closed path: of all voltage drops = 0 In any closed path: of all voltage rises = 0

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L Haken ECE110 transparencies – set 1 page 4 How many closed paths (loops) are in this diagram? Write two loop equations. You can start anywhere in a loop, and go clockwise or counterclockwise. Be careful about signs: is it a voltage drop or a voltage rise?
L Haken ECE110 transparencies – set 1 page 5 The battery symbol has an implied + on the side with the long line. Write in the + and – for clarity, and label nodes. Write a loop equation, and solve for V AB . Watch your signs!

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L Haken ECE110 transparencies – set 1 page 6 Kirchhoff Current Law (KCL) For any portion of the circuit, These are called KCL node equations; all three are equivalent. (You can liken this to the network of water distribution pipes for a town. The network of pipes is like a node in a circuit. The total amount of water entering the network of pipes from the water tower equals the total amount of water leaving in buildings around town.)
L Haken ECE110 transparencies – set 1 page 7 For this problem, use + for flow into a node, - for flow out.

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## This note was uploaded on 09/16/2009 for the course ECE 110 taught by Professor Haken during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Haken ECE 110 Handout 1 - ECE 110 Transparencies Set 1 for...

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