lecture03_06_25_2010 - EE40 Lecture 3 Josh Hug 6/23/2011...

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1 EE40 Summer 2011 Hug EE40 Lecture 3 Josh Hug 6/23/2011
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2 EE40 Summer 2011 Hug Logistical Notes • HW1 still due next Wednesday at 5 PM in Cory 240 • First discussion is today at 2 PM right after class in 81 Evans – It will be problem oriented • Post-lab 0 biography now on bspace • Did anybody not receiver my emails sent to ee40-su11@lists.berkeley.edu? – Make sure you’re on the list – If not, sign up at http://lists.berkeley.edu
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3 EE40 Summer 2011 Hug Reminder • There are lots of TA office hours every week • Feel free to skim the chapters. – The important stuff will be on the homeworks and reading assignments. – If you’d like to read everything though, please do so, and we’re happy to answer any questions – Future reading assignments will be a little more specific
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4 EE40 Summer 2011 Hug Notes • HW Problem 2: – An ideal voltmeter has infinite resistance (acts like open circuit, no current flow) • V=IR is dependent on your reference directions • Kitchen sink method can be really confusing to use – you get so many equations. Today we’ll learn a method superior to the KSM in every way
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5 EE40 Summer 2011 Hug Have you done any reading problem sets? • A) No • B) One of them • C) Two of them • D) All 3
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6 EE40 Summer 2011 Hug Practice problems/homework? • A) Haven’t even looked at them • B) Gave them a quick read • C) Completed a few problems • D) Completed many problems • E) Completed all problems that we’ve covered so far in class (or more)
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7 EE40 Summer 2011 Hug There are better ways to solve circuits • The kitchen sink method works, but we can do better – Current divider – Voltage divider – Lumping series and parallel elements together (circuit simplification) – Node voltage – Superposition – Simulation
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8 EE40 Summer 2011 Hug Resistor Networks • Consider the circuit above, which circuit below will draw the same amount of current from an arbitrary source? a) b) c) d)
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9 EE40 Summer 2011 Hug There are better ways to solve circuits • The kitchen sink method works, but we can do better – Current divider – Voltage divider – Lumping series and parallel elements together (circuit simplification) Node voltage – Superposition – Simulation
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10 EE40 Summer 2011 Hug The Node Voltage Technique • We’ll next talk about a general technique that will let you convert a circuit schematic with N nodes into a set of N-1 equations • These equations will allow you to solve for every single voltage and current • Works on any circuit, linear or nonlinear! • Much more efficient than the kitchen sink method • More general than the divider and circuit simplification techniques
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11 EE40 Summer 2011 Hug Definition: Node Voltage and Ground Node • Remember that voltages are always defined in terms of TWO points in a circuit • To use node voltage, we must label one node in our circuit the “ground node” – Any node can be “ground” , it doesn’t matter which one you pick, denoted by: – Has NO physical meaning: Does not mean that
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This note was uploaded on 09/09/2011 for the course EECS 40 taught by Professor Chang-hasnain during the Summer '08 term at University of California, Berkeley.

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lecture03_06_25_2010 - EE40 Lecture 3 Josh Hug 6/23/2011...

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