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Transistor of the p-p-p can be regarded as two semiconductor diode with a total area of ​​n. The first of these "diodes"-emitter junction is included in the forward direction, and even a weak input signal is relatively easy to create its current. Charges that fall from the emitter to base eventually come to the second diode (collector pn junction) and under the influence of relatively high voltage batteries produce current collector, which provides the necessary power to the load. When using a transistor amplifier stage between the base and collector include a battery (the voltage is usually a few volts), which gives the energy necessary to produce the amplified signal. "Plus" of this battery is connected to the base, and "minus" to the collector. Thus, the pn transition between the base and collector (collector junction) is actually a diode in "reverse" direction, and then there is almost no current leaking.
At the emitter, by contrast, serves a small (typically a few tenths of a volt) positive voltage, and therefore the transition between the emitter and base (emitter junction) is actually a diode in the forward direction, that is a good current-carrying.

But both of these pn junctions (emitter and collector) cannot be viewed as two separate, isolated semiconductor diode, as they have a common zone of n - a crystal of germanium. Therefore, when a current in the emitter circuit, then at the same time there is a current in the collector circuit: Almost all of the positive charges that fall from the emitter to base, "seep" through it (a phenomenon called diffusion) fall in the collector junction and immediately begin to move to the collector under the influence of negative voltage on it. This tension helps to positive charges easily overcome the resistance of the collector pn junction. You obviously have not forgotten that the collector junction - a diode in the opposite direction, that is, having a high resistance! Moreover, if the collector circuit to include some resistance (resistance load), the collector current, having spent part of the energy derived from the battery, And overcome this resistance by providing the proper power to it.