Going through the beginner projects in the Uno Starter Kit.
My question is: does it matter the order components are inserted into a particular row on a breadboard? For instance I have a resistor and phototransistor on row 17. The resistor is plugged into 17C (then to ground). The cathode of phototransistor is in 17E. Wonder if it matters if I connect the wire (to sense voltage change via an analog port) to 17A, 17B, or 17D?
If I follow your rambling question, Row x connections A,B,C,D and E are all connected together. And F,G,H and I are all connected together.
Without a schematic, one can only guess what you are trying to do.
If you have ten different bills of different currency
values in your wallet does it matter in what order
you place them in your wallet ?
My question is: does it matter the order components are inserted into a particular row on a breadboard?
A breadboard just has little holes for allowing metal legs of electronic components to be inserted into the holes ------ for metal legs having a suitable size that fits those holes that is.
Within each hole is a metal spring-clip that make a physical and electrical connection to the component leg (once the component is inserted).
The attached pic shows the basic internal electrical connections of how the spring clips for the various holes are electrically interconnected.
In general, we just need to focus on making sure that the legs of components and/or wires are correctly connected (electrically) to other electrical components and/or wires.
The breadboard just allows us to cut down on the amount of physical wire pieces needed for connecting our circuit together.
The circuit configuration you have for your circuits ----- eg. series connections parallel connections ----- is just up to you. You plan the configuration in advance (generally), and you just basically use the breadboard for connecting your circuit together.
Also ------ the line of holes that spans column #5 'abcde' are NOT electrically-connected to the line of holes along column #5 'fghij'. Similarly, the line of holes that spans column #30 'abcde' are NOT electrically-connected to the line of holes along column #30 'fghij'.
Southpark:
The breadboard just allows us to cut down on the amount of physical wire pieces needed for connecting our circuit together.
Well, actually it is a method of joining wires, an alternative to soldering, or using screws or clips - which latter two would be most inconvenient.
Popular electronics construction kits used springs to connect wires
Paul__B:
Well, actually it is a method of joining wires, an alternative to soldering, or using screws or clips - which latter two would be most inconvenient.
Both sorts of 'breadboards' - the one with holes, and the ones with the springs - are methods that allow for re-use of components (without generally destroying or wasting too much the original metal legs of components) - convenient for selected kinds of prototyping and/or circuit testing ------ and other purposes. Each have their own nice features and not-so-nice features. But definitely - if we only have one kind ----- then just have to make-do and use what we have. Or using both for a circuit system is ok too ----- if it helps.
raxxillion:
My question is: does it matter the order components are inserted into a particular row on a breadboard?
No, all the 5 or 6 connections in a row are shorted together, so they are electrically equivalent,
they are the same node in the circuit.
MarkT:
No, all the 5 or 6 connections in a row are shorted together, so they are electrically equivalent,
they are the same node in the circuit.
Thank you so much, this is the particular answer I needed. Thank you to everyone else as well. You either helped confirm or taught me an additional item I needed to learn.
RadioShack VHF Radio Kit ?
Just something I found on the Duck.
You don't need to re-attach a file from my image, just use the same link I did ("Copy Image location")! 
Speaking of Duck2go, there is presently a stoush between the Australian Government and Google (and Facebook) regarding requiring Google and Mark to pay news providers for material it re-publishes (presumably such as through YouTube). Google of course does not wish to pay and threatens to withdraw their search engine access from Australia if the law passes.
Shock Horror! 
Should be interesting. The government sees no reason to kowtow to Google. There are other search engines and Google is not as useful (helpful) as it once was. Don't be evil?
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