Let's get started with the course. 
There are five modules in this course. 
We are starting with module one, the 
background section. 
The background section covers the basic 
topics of charge, current, voltage, and 
power. 
So, we define each of these concepts a 
little bit more from the physics 
perspective. 
And then we will discuss what a resistor 
is, what voltage and current sources are, 
and we will give some circuits. 
And the basic construct of a circuit 
diagram.