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The bipolar junction transistor (BJT) was the first type of transistor to be mass-produced. Bipolar transistors are so named because they conduct by using both majority and minority carriers. The three terminals are named emitter, base and collector. Two p-n junctions exist inside a BJT: the base/collector junction and base/emitter junction. The BJT is commonly described as a current-operated device because the emitter/collector current is controlled by the current flowing between base and emitter terminals. Unlike the FET, the BJT is a low input-impedance device. The BJT has a higher transconductance than the FET. Bipolar transistors can be made to conduct with light (photons) as well as current. Devices designed for this purpose are called phototransistors.