Assertion: transistor's emitter | /r/AtLocation | order
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text: You can interpret that arrow in a couple ways: it's the direction of positive current flow (opposite of electron flow), and also as pointing toward the lower voltage when the transistor is switched on, i.e. for an NPN the emitter has to be at a lower voltage than the base/collector in order for it to conduct, whereas for a PNP it has to be higher.