3 ms·
In the last drawing I noticed the person wrote 2.2k . This is weird for me, for resistors I usually write 2k2 and see others do the same - I also imagine the tw
by a1o 2y ago
In the last drawing I noticed the person wrote 2.2k . This is weird for me, for resistors I usually write 2k2 and see others do the same - I also imagine the two red stripes already...
- kragen 2y agoI write 2.2kΩ, but I'm used to seeing people just write "2.2k" on schematics (because obviously it isn't 2.2kH or 2.2kV, and also it's next to a resistor symbol). I think the 2k2 thing is maybe one of those young whippersnapper things like nanofarads, or maybe a European thing. I grew up with 0.001μF capacitors, not 1nF capacitors.
- adrian_b 2y agoSome physically smaller resistors are marked 2k2 instead of 2.2k, because this requires less space for the marking and it also avoids ambiguities that could happen when the decimal point is too small or erased and 2.2k could be misread as 22k.
- kragen 2y agoRed red red gold takes less space than that; it's only four pixels, though most of us have never seen a resistor marked with spots instead of stripes.
- adrian_b 2y agoI agree, but for some reason the marking with color stripes or points appears to have gone out of fashion. Perhaps the colored marking was more expensive or the marking equipment was slower than what is used now.
- kragen 2y agoI think color codes require less manufacturing precision but more colors.