/diy/ - Do It Yourself

>>2040251
KVL and KCL are Kirchhoff's voltage and current laws. They're useful, though in the end they're just derived from Ohm's law. KVL is: voltages add in series, all voltages in a circuit add to 0V (+12V from the supply, -5V from one resistor, -5V from another, -2V from the third). KCL is: currents add in parallel, all currents going into a junction add to 0A (100mA in one side, 40mA out one side, 60mA out the other). They're a good way of analysing simple circuits like the one you've drawn.
If they aren't working out nicely, then you might need Millman's theorem, which too is derived from Ohm's law.

>Did I fuck up the drawing
Yes. Should be picrel for measuring R4, same for R3. R2 is correct.

>>2040271
>I have been enjoying his videos a lot lately
Because you're 12. They're ok for understanding simple concepts for those new to the field, but they don't really teach that much beyond that. Compare them to Big Clive's, who examines how something (an LED light bulb for example) works, takes it apart, retraces the circuit diagram, and points out what each component is doing. Often also pointing out ways it could be modified, or other uses for some of the parts.