<electronics> A transistor made from a sandwich of n- and p-type
semiconductor material: either npn or pnp. The middle section is known as the
"base" and the other two as the "collector" and "emitter". When used as an
amplifying element, the base to emitter junction is in a "forward-biased"
(conducting) condition, and the base to collector junction is "reverse-biased"
or non-conducting. Small changes in the base to emitter current (the input
signal) cause either holes (for pnp devices) or free electrons (for npn) to
enter the base from the emitter. The attracting voltage of the collector causes
the majority of these charges to cross into and be collected by the collector,
resulting in amplification.
Contrast field effect transistor.
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