pastel rainbow stripes

electrical engineering notes

i never studied electrical engineering, and generally am a complete novice. below are some notes i’ve been taking as i learn. i’m also taking notes on specific icon representing the epistemic certainty of the linked pageintegrated-circuits while learning about making a icon representing the epistemic certainty of the linked pagediy-synthesizer. i found that the hydraulic analogy was useful for learning more about the concepts and having something to map them to.


ohms law

I = current (amperes) V = voltage (volts) R = resistance (ohms)

I = V / R
V = I * R
R = V / I

faraday’s law

predicts how a magnetic field will interact with an electric circuit to produce a electromagnetic field, which is, electromagnetic induction

The electromotive force around a closed path is equal to the negative of the time rate of change of the magnetic flux enclosed by the path.




one side has no resistance, other is infinite (ideally). they ensure current flows in one direction

cathode - short leg: negative end anode - long leg: positive end

light emitting diode (LED) - converts electricity into light


resistors simply resist current! then converts current into heat.

resistors are made out of insulators and conductors. more insulators is equal to more resistance.

resistors have stripes on them. read about the electronic color code.

resistors also can serve as heating elements. if you think about a toaster, or a hair dryer, they function by means of the same mechanism as resistors.

water analogy: smaller pipe = bigger resistor


stores electric charge in an electric field. it is :

electrolitic capacitors are bigger - they are polarized. cermaic capacitors don’t store very much charge - not polarized.

water analogy: a bucket that empties when full sorta?


a three terminal resistor.

there is dial against a graphite disk the more graphite that it has to go through, the more resistance. the pivot point is connected to the middle. side pins are the opposite sides.

the terms are called:

integrated circuit

a specific set of capacitors, inductors, transistors, resistors in a circuit.

these look like small “chips”. “living bug” position refers to it being with its legs down. and the flat part is at the top.

the pins on an IC have numbers like so:

10 9 8 7 6
 | | | | |
|\         |
| |        |
|/         |
 | | | | |
 1 2 3 4 5

where the left side has a marker like a half circle

voltage divider




Read more about the history of these names here.


short for Analog to Digital Converter


specific integrated circuits

i decided to start keeping track of specific ICs in the icon representing the epistemic certainty of the linked pageintegrated-circuits page.

CMOS 4000 Series


within electrical engineering, we need to read schematics. they’re designs that specify the components of a electrical circuit. reading schematics mostly involves learning a number of small icons used as a visual language to represent components. see this useful sparkfun guide on reading schematics.


BOM usually stands for bill of materials - a list of all the components or eletronics or pieces used in a circuit or build.





last updated: