breadboard How does current flow through this Arduino circuit

  
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It seems to me like the wire connected to the 5v pin is connected to the + pins of the breadboard. which are connected to nothing. There`s nothing else on the + column. I know this is a basic `google it` question, but probably due to the fact that I don`t have the vocabulary to do so I`ve not been able to find a description of current flow in an Arduino.
breadboard How does current flow through this Arduino circuit - schematic




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