When a potential difference of 0.7V and above appears at the base terminal, the BE junction diffuses and causes the CB junction to diffuse. Initially, when no current flows through the base, the resistance across CE is so high that no current flows through it. To better understand current control, a transistor can be thought of as a variable resistor across the collector (C) and emitter (E), whose resistance changes according to the current through the base (B). This current is negligible since their units are pA or nA. Theoretically, the switch is fully open, but in practice a leakage current can be observed.
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