Electronics course mit 6.002 lecture 1
Course playlist:
https://www.youtube.com/playlist?list=PL9F74AFA03AA06A11
Lecture notes:
https://ocw.mit.edu/courses/6-002-circuits-and-electronics-spring-2007/pages/lecture-notes/
Further readings:
Labs:
https://ocw.mit.edu/courses/6-002-circuits-and-electronics-spring-2007/pages/labs/
Homework:
https://ocw.mit.edu/courses/6-002-circuits-and-electronics-spring-2007/pages/assignments/
Exams:
https://ocw.mit.edu/courses/6-002-circuits-and-electronics-spring-2007/pages/exams/
Websim:
http://euryale.csail.mit.edu/
Download course:
https://ocw.mit.edu/courses/6-002-circuits-and-electronics-spring-2007/download/
Engineering is the purposeful use of science.
In this course, we will see the gainful employment of Maxwell's equations. It will be a transition from physics to analog and digital systems.
Further playlist: 6.004- How to build computers from simple digital objects.
We take measurements from nature and make tables of observations then we build systems as engineers.
From these observations, we can make abstractions as in laws of physics. So, the Maxwell's equations are also abstractions.
Lump circuit abstraction
We call certain things pure resistances, some other things are pure capacitances, some other things are pure voltage sources. This is the first layer then to this layer we apply the second layer.
Amplifier abstraction
Then layers of a bunch of these lump objects and you can build an amplifier. And, you can start to play around with these amplifiers and get even better circuits.
Digital abstractions
In this, we build inverters and combinational gates.
So, we are gradually building bigger and bigger things that have complex behavior inside but it is very easy to describe them.
Combinational logic
THis leads to function blocks which means there are some inputs, some functions, then some outputs.
Clocked digital abstraction
There will be some notion of time introduced into the system.
x86 abstraction
These are microprocessors.
Language abstractions
Operating system abstractions
Linux, windows
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F=ma
is a point mass simplification.
Applied to electronics
How much current flows through this bulb?
It is hard to know until we make a simplification like the point mass simplification.
We replace the bulb with a resistance R and we can easily apply
V= IR
How would we solve this question without using simplification? By using Maxwell's equation but in engg, we learn to simplify objects.
What did we do?
Take a look at the bulb filament.
We will use lumped matter discipline.
We made a wild assumption when we used the resistance instead of the bulb filament. What was it?
The (del q)/(del t) means that charge could build up in the filament. But, we assume that no charge builds up in the filament so, the (del q)/(del t) becomes zero. So, whenever we use resistance or an inductor or resistance, we make the assumption that within the black box (which encloses the filament) there is no build-up of charge.
Abstractions or models are valid only when they are used within certain constraints.
Too much voltage can set fire to a resistor. Ideally, the current in amp should go on increasing but it does not really.
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We can connect the lumped elements in circuits. Then, we get Kirchoff's voltage law:
We have already assumed that the charge build-up in the circuit is zero. So, the rate of change of flux in the whole circuit is zero. (Del phi B)/(Del t) is zero.
Lumped element model: https://en.wikipedia.org/wiki/Lumped-element_model
Notes of all kinds of lumped elements used in engg
https://inst.eecs.berkeley.edu/~ee100/fa08/lectures/EE100supplementary_notes_1a.pdf
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