TerminologyTransistors are comprised of N-Type and P-Type materials. The transistors shown below are called bi-polartransistors because they have two polarity changes in the materials it is made from.A bi-polar transistor has three wires attached to it: One is called the emitterOne is called the baseAnother is called the collector.The voltage level on the base controls the transistor and can allow current between the emitter and thecollector. The base current is typically very small compared to the emitter-collector current. The ratio of the base current to the emitter-collector current is called the transistor's beta (or amplification)
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