Rowan Hall 238A September 12, 2006 Networks I for M.E. ECE James K. Beard, Ph.D.

Slide 2 Networks I for M.E. September 12, 2006 Networks I Today’s Learning Objectives –  Analyze DC circuits with passive elements including: resistance  Learn about switches  Introduce KVL and KCL  What is voltage and current division?  Parallel and series sources  Solve some more difficult problems

Slide 3 Networks I for M.E. September 12, 2006 chapter 2 - overview engineering and linear models - done engineering and linear models - done active and passive circuit elements - done active and passive circuit elements - done resistors – Ohm’s Law - done resistors – Ohm’s Law - done done dependent sources – done done independent sources – done transducers – done switches – in progress

Slide 4 Networks I for M.E. September 12, 2006 Switches SPST SPDT Make before break SPDT

Slide 5 Networks I for M.E. September 12, 2006 examples Exercises and p. 40

Slide 6 Networks I for M.E. September 12, 2006 Homework 2 - problem see p. 50

Slide 7 Networks I for M.E. September 12, 2006 ch. 1 & 2 important concepts Circuits; current; voltage; power Passive sign convention Active and Passive elements Linearity - superposition + homogeneity Resistors and Ohm’s Law Sources - Ideal, independent and dependent Opens and Shorts Switches

Slide 8 Networks I for M.E. September 12, 2006 chapter 3 - overview electric circuit applications define: node, closed path, loop Kirchoff’s Current Law Kirchoff’s Voltage Law a voltage divider circuit parallel resistors and current division series V-sources / parallel I-sources resistive circuit analysis

Slide 9 Networks I for M.E. September 12, 2006 electric circuit applications electric telegraph transatlantic cable engineers vs. scientists those who can do, those who can’t teach? excerpt from the history of electricity

Slide 10 Networks I for M.E. September 12, 2006 resistive circuits we are ready to make working circuits with resistive elements and both independent and dependent sources. words we know: short, open, resistor new words:  node  closed path  loop

Slide 11 Networks I for M.E. September 12, 2006 more definitions node: a junction where two or more are connected closed path: a traversal through a series of nodes ending at the starting node loop:

Slide 12 Networks I for M.E. September 12, – NODE V R1R1 R2R2 PATH OR LOOP ARE THESE TWO NODES OR ONE NODE? an illustration