Moreover, a positive voltage is transferred to the emitter terminal to allow current flow from the emitter to collector in a PNP transistor. A positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter in an NPN transistor. Transistors restrict the amount of current passed according to a smaller, controlling current. The prime function of the bipolar transistors controls and regulates the current in any device. At the time of operation, the voltage polarities as well as current directions for each kind of transistor are exactly opposite to each other. The proper and exact polarity of the junctions when operating is the main difference. There is a functional difference between an NPN transistor and PNP transistor. The market for bipolar junction transistor has been segmented geographically into Asia Pacific, Europe, North America, South America and Middle East and Africa. The market for bipolar junction transistor is segmented on the basis of application which includes temperature sensors, electronics, digital logic, amplifiers and logarithmic converters among others. The bipolar junction transistor market is segmented by type which includes NPN transistors, PNP transistors and heterojunction bipolar transistor. Moreover, it also has wide range of applications across electronic devices and equipment which includes televisions, computers, audio amplifiers, mobile phones, radio transmitters and industrial control. Bipolar junction transistor has application as switches or amplifiers. The primary function of a BJT (bipolar junction transistor) is to amplify current. Bipolar junction transistor is a sort of transistor which primarily uses both hole and electron and charge carriers.
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