EGR 224/Concept List/S23

The notes below are not meant to be comprehensive but rather to capture the general topics of covered during lectures in EGR 224 for Spring 2023. These notes are in no way a replacement for actively attending class.

Lecture 1 - 1/11 - Course Introduction, Nomenclature

• Main web page at http://classes.pratt.duke.edu/EGR224S23/
• Circuit terms (Element, Circuit, Path, Branch and Essential Branch, Node and Essential Node, Loop and Mesh).
• Accounting:
  • # of Elements * 2 = total number of voltages and currents that need to be found using brute force method
  • # of Essential Branches = number of possibly-different currents that can be measured
  • # of Meshes = number of independent currents in the circuit (or generally Elements - Nodes + 1 for planar and non-planar circuits)
  • # of Nodes - 1 = number of independent voltage drops in the circuit

Lecture 2 - 1/13 - Electrical Quantities

• Electrical quantities (charge, current, voltage, power)
• Passive and Active Sign Convention

Lecture 3 - 1/20 - Voltage and Current; Power and Energy

• Power redux
• Passive Sign Convention and Active Sign Convention and relation to calculating power absorbed and/or power delivered.
• Kirchhoff's Laws
• Example of how to find $$i$$, $$v$$, and $$p_{\mathrm{abs}}$$ using conservation equations
• $$i$$-$$v$$ relationships of various elements (ideal independent voltage source, ideal independent current source, short circuit, open circuit, switch)

Lecture 4 - 1/23 - Equivalents

• $$i$$-$$v$$ relationship for resistors; resistance and conductance
• $$i$$-$$v$$ for dependent (controlled) sources (VCVS, VCCS, CCVS, CCCS)
• Combining voltage sources in series; ability to move series items
• Combining current sources in parallel; ability to move parallel items
• Equivalent resistances
  • series and parallel
  • Examples/Req

Lecture 5 - 1/21 - Voltage Division and Current Division

• Delta-Wye equivalencies (mainly refer to book)
• Voltage Division
• Current Division