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Lecture 1. Course Overview System modeling, analysis and design Basic Circuit Parameters Passive Sign Convention Related educational module: Section 1.1. Pre-requisite and Co-requisite requirements. Pre-requisites (recommended) Basic exposure to electricity and magnetism

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lecture 1

Lecture 1

Course Overview

System modeling, analysis and design

Basic Circuit Parameters

Passive Sign Convention

Related educational module:

Section 1.1

pre requisite and co requisite requirements
Pre-requisite and Co-requisite requirements
  • Pre-requisites (recommended)
    • Basic exposure to electricity and magnetism
    • Two semesters of Calculus
  • Co-requisites (recommended)
    • Differential equations
  • Pre- and Co-requisite requirements are rather weak
    • Superficial introductions to necessary topics provided at the appropriate points during this course
course goals
Course Goals
  • Introduction to modeling, analysis and design of electrical circuits
  • We will often use a systems-level approach:
what are modeling analysis and design
What are modeling, analysis and design?
  • We model the system by determining the mathematical relationship between the input and the output
  • System analysis often refers to determining the output from a system, for some given input
  • System design involves creating a system to provide some desired output
circuits i modeling approach
Circuits I modeling approach
  • We will restrict our attention to lumped parameter models of linear, time-invariant systems
    • Governing equations will be linear, constant-coefficient, ordinary differential equations
slide8

Slinky demo

    • Linear
    • Nonlinear
    • Lumped
    • Distributed
basic circuit parameters
Basic Circuit Parameters
  • Charge (q) is the basic quantity in circuit analysis
    • Units are Coulombs (C)  1 Coulomb  -6.241018 electrons
  • Current (i) is the rate of change of charge with time:
    • Units are Amperes (A) 
basic circuit parameters continued
Basic Circuit Parameters – continued
  • Voltage (v) is the change in energy of a unit charge at two different points:
      • Units are Volts (V) 
basic circuit parameters continued1
Basic Circuit Parameters – continued
  • Power (P) is the time rate of change of energy:
    • Units are Watts (W)
passive circuit elements
Passive Circuit Elements
  • For a passive circuit element, the total energy delivered to the circuit element by the rest of the circuit is non-negative
    • The element can store energy, but it cannot create energy
  • Active circuit elements can supply energy to the circuit from external sources
passive sign convention
Passive Sign Convention
  • We will assume the sign

of the current relative to

voltage for passive circuit

elements

  • Positive current enters the

node at the higher voltage

    • Sign must be known for active circuit elements
passive sign convention continued
Passive Sign Convention – continued
  • You can assume (arbitrarily) either the voltage polarity or the current direction
    • This assumption dictates the assumed direction of the other parameter
  • These assumptions provide reference voltage polarities and current directions
  • Subsequent analysis is performed based on this assumption; a negative result simply means that the assumed voltage polarity or current direction was incorrect
passive sign convention example 1
Passive Sign Convention – Example 1
  • Provide the appropriate sign convention for the missing parameter on the passive elements represented by grey boxes.
passive sign conventions hints
Passive Sign Conventions – Hints
  • It is generally counter-productive to attempt to determine the “correct” voltage polarities and current directions before analyzing the circuit
  • Just arbitrarily choose either the assumed voltage polarity or current direction for each passive circuit element
    • This choice dictates the sign of the other parameter
  • Perform analysis using assumed signs
    • Negative signs mean that the assumption was incorrect
passive sign convention example 2
Passive Sign Convention – Example 2
  • Assign reference voltage and current directions for the passive elements represented by shaded boxes in the circuit below:
passive sign convention example 3
Passive Sign Convention – Example 3
  • Assign reference voltage and current directions for the passive elements represented by shaded boxes in the circuit below:
passive sign convention example 4
Passive Sign Convention – Example 4
  • For the circuit below, the sign convention shown is chosen
  • After analyzing the circuit, it is determined that I1 = -3mA, I2 = 3mA, V1 = -1.5V, and V2 = 2.5V. Re-draw the circuit showing the actual voltages and currents and their directions
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