Probably already mentioned, but looking at the "schematic symbols" - I noticed they didn't mention the (usually international) form of values - ie 2k5 - meaning 2.5k.
Also - they show symbols for potentiometer and variable resistor, but they don't show how if you connect the wiper to one end of the potentiometer, that means "variable resistor" (and is how you usually make one - unless using the potentiometer as an actual rheostat, which means connecting between one end and the wiper, leaving the other end free; electrically it's equivalent to not leaving the wiper floating with respect to the other end, but in a real rheostat, there is no "other end" to connect with - not without modification of the rheostat).
Then the battery symbols - and this isn't on them, but more the "standard"; yes, positive is the long side for a series of cells - but on virtually every standard consumer battery cell (C, D, AA, AAA), which end is the positive end? Yep - the one with the "bump" or "short end".
Even on the 9 volt battery, the smaller terminal is the positive end.
The only time things are "proper" are with coin cells, where the positive end is the flat plate (usually with writing), with the negative being the smaller plate surrounded by the edge of the positive plate on the other side. Knowing humans, though, I wouldn't be surprised if there was a coin-style cell where that was reversed...
I expect, though I don't know, that the battery stuff is the result of history (much like how positive and negative aren't really correct per physics as to how current really "flows").
I'm sure there's more weird stuff in Sparkfun's tutorial; it seems mainly geared for an American audience, and also toward older-styled symbols (like you'd find on schematics from the 1960s-80s). Most of the newer style haven't changed too dramatically - but there are some differences (they did note the resistor differences - but I've seen some others).
'.' and ',' generally can be rubbed off or overlooked if the font is too small or if printed on paper/plastic, etc, hence the more reliable notation you mentioned.
Also - they show symbols for potentiometer and variable resistor, but they don't show how if you connect the wiper to one end of the potentiometer, that means "variable resistor" (and is how you usually make one - unless using the potentiometer as an actual rheostat, which means connecting between one end and the wiper, leaving the other end free; electrically it's equivalent to not leaving the wiper floating with respect to the other end, but in a real rheostat, there is no "other end" to connect with - not without modification of the rheostat).
Then the battery symbols - and this isn't on them, but more the "standard"; yes, positive is the long side for a series of cells - but on virtually every standard consumer battery cell (C, D, AA, AAA), which end is the positive end? Yep - the one with the "bump" or "short end".
Even on the 9 volt battery, the smaller terminal is the positive end.
The only time things are "proper" are with coin cells, where the positive end is the flat plate (usually with writing), with the negative being the smaller plate surrounded by the edge of the positive plate on the other side. Knowing humans, though, I wouldn't be surprised if there was a coin-style cell where that was reversed...
I expect, though I don't know, that the battery stuff is the result of history (much like how positive and negative aren't really correct per physics as to how current really "flows").
I'm sure there's more weird stuff in Sparkfun's tutorial; it seems mainly geared for an American audience, and also toward older-styled symbols (like you'd find on schematics from the 1960s-80s). Most of the newer style haven't changed too dramatically - but there are some differences (they did note the resistor differences - but I've seen some others).
I'll have to read this in more detail later...