collector

…the p region is the collector. The circuit arrangement in Figure 4B is known as a common-base configuration. The arrows indicate the directions of current flow under normal operating conditions—namely, the emitter-base junction is forward-biased and the base-collector junction is reverse-biased. The complementary structure of the p-n-p bipolar transistor is…

…(or base), and drain (or collector) of the circuit. In normal operation, such as in an amplifier circuit (see figure), there are provisions (batteries in this case) for applying a small forward bias to the base-emitter junction and a larger reverse bias to the base-collector junction. Resistors are arranged in…