That is a fairly specialised though very useful type of transistor and we will not bother with it any further here in this particular tutorial. With the above transistor, if the base is open, then a small amount of current flowing into the base will lead to a much larger current flow in the collector. The ratio is the gain of the particular transistor. Hence a transistor is known as a current amplifier. Do not take the EBC connections or leads of transistors for granted.
Different manufacturers have different pin outs, even for the same type.
In a transistor amplifier we have two totally different sets of conditions. One set are the d.c. conditions and the other set is the a.c. or r.f. conditions. Let's deal with the d.c. conditions first because we have to overcome one peculiar aspect of this type of transistor. It has to be turned on or have the base opened. To do this, the base has to have a voltage applied to it which is approximately 0.65V higher than the voltage level at the emitter.