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What is the direction of current in a NPN transistor?
In an NPN transistor, the flowing current runs from the collector terminal to the Emitter terminal, whereas in a PNP, the flow of current runs from the emitter terminal to the collector terminal.
When the collector current in a transistor is zero?
When no signal is applied, a DC current I C will flow in the collector circuit due to the battery. This is known as zero signal collector current. The value of zero signal collector current should be at least equal to the maximum collector current due to AC signal alone.
What controls the collector current of a transistor?
Hello, The base current controls the collector current when the transistor is in the active region. A transistor is made up of two PN junctions, an emitter junction and a collector junction. The active region is when the emitter junction is forward biased and the collector junction is reverse biased.
In a common emitter NPN transistor the relation between collector current and emitter current is given as. I C = β I B. In active region the NPN transistor acts as a good amplifier. In common emitter NPN transistor total current flow through the transistor is defined as the ratio of collector current to the base current IC/IB.
What happens if I bias the collector and emitter of an NPN?
(1). As the collector doping is less than the emitter doping, the hole current in the collector (now the emitter) increases, leading to lower beta. (2). The voltage withstand capability goes down, as now the BE junction is reverse biased, and the emitter is not constructed for high withstand voltage.
What is the relation between collector current and emitter current?
In a common emitter NPN transistor the relation between collector current and emitter current is given as In active region the NPN transistor acts as a good amplifier. In common emitter NPN transistor total current flow through the transistor is defined as the ratio of collector current to the base current IC/IB.
How does the current flow through the collector-base?
Current flows from base to emitter. That is straightforward. Current also flows from base to collector. Hopefully, that is also straightforward. In both cases, current is flowing across a forward biased junction when the transistor is in saturation. Due to transistor action, current also flows from collector to emitter.