Well welcome we've completed all our 
regular lessons in this module. 
So now it's time to do a Wrap Up of 
Module 3. 
Looking back at our Concept Map. 
We pulled forward the ideas of current 
and voltage, and sources and resistance 
from our background module. 
And from a Resistive Circuit module, we 
pulled forward all those methods to 
obtain circuit equations. 
The idea of a KCL, and KVL, mesh, node, 
and Thevenin methods all apply to 
reactive circuits. 
Ohm's law applies to reactive circuits. 
Everything we studied in Resistive 
Circuits applied in Reactive Circuits. 
And in the area of reactive circuits we 
looked at capacitors and inductors. 
We studied first order differential 
equations and how we would apply those to 
solving and analyzing RC, and RL 
Circuits. 
Then we looked at second order 
differential equations, and their basic 
generic solutions, and we saw how that 
can applied to RLC circuits. 
We looked at some applications of 
inductance and capacitance outside the 
area of ECE. 
The important concepts and skills that 
you're going to need to know in order to 
be able to do well on the quiz for this 
module. 
Let's start with the area of capacitance 
and capacitors. 
You need to understand the basic 
structure of a capacitor and its 
fundamental physical behavior. 
Understand the and be able to use the i-v 
relationship to calculate current from 
voltage or voltage from current. 
Be able to reduce capacitor connections 
using parallel and series connections. 
So if you have several capacitors, you 
should be able to reduce it down to one. 
Be able to calculate energy in a 
capacitor. 
Be able to sketch 
current/voltage/power/energy curves. 
For inductance and inductors, be able to 
describe the construction behavior of 
inductor. 
Be able to use the i-v relationship to 
find the current through the inductor 
from the voltage across it, and also, be 
able to find the voltage given the 
current. 
Be able to explain how voltage is created 
across an inductor. 
Be able to analyze inductors in series 
and parallel. 
And again, be able to reduce several 
inductors down to one. 
Be able to calculate the energy in an 
inductor. 
And be able to sketch current voltage 
power energy curves. 
We looked at first order differential 
equations, and under that topic, given a 
constant input, and a first order 
differential equation. 
You should be able to determine the 
steady-state value, time constant and you 
should be able to sketch the response. 
For RC and RL circuits, you should be 
able to write a differential equation 
governing the behavior of the circuit. 
And you should be able to calculate the 
time constant, steady-state value and be 
able to sketch the response. 
For second-order differential equations, 
you should be able to identify the 
steady-state value, be able to predict 
the type of response from the roots. 
We looked specifically at underdamped, 
critically damped, and overdamped, and 
you should be able to identify the type 
of plot. 
How the plot is going to look, whether a 
damp sine wave or whether it looks 
exponential. 
We applied the second-order differential 
equations to RLC circuits. 
You should be able to write the 
differential equation that governs 
behavior of this sort of circuit. 
Be able to predict the type of response 
underdamped, critically damped, 
overdamped. 
You should be able to compute the damping 
factor and the resonant frequency. 
And you should know that the smaller the 
damping factor, the larger the 
oscillations, [UNKNOWN] of applications. 
You should know the purpose of an 
oscilloscope and a function generator. 
You should know several applications of 
conductors and capacitors when they're 
used with non-electrical components. 
Speficially, we looked at sensors and 
actuation. 
So that concludes the first three modules 
of this course. 
Our next module is going to be frequency 
analysis. 
As a reminder, do all homework for this 
module, study for the quiz, and continue 
to visit the forum, to ask questions. 
And please try and answer questions from 
others. 
Thank you and good luck on the quiz.