Mell How does current flow through NPN?
The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). The emitter “emits” electrons into the base, which controls the number of electrons the emitter emits. The transistor is kind of like an electron valve.
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.
How the electrons and holes current flow in the PNP transistors?
The holes in the collector are filled by electrons that flow from the negative terminal of the battery. At the same time the electrons leave the negative terminal of the battery, other electrons in the base break their covalent bonds and enter the positive terminal of the battery.
Is holes are the majority charge carriers in NPN transistor?
Explanation: In npn transistor, the left side n-region (emitter) is heavily doped. So the emitter has a large number of free electrons. We know that in p-type semiconductor, holes are the majority charge carriers and free electrons are the minority charge carriers.
How does current flow in PNP transistor?
The current inside the transistor is created by the movement of holes, and the current in the transistor’s leads is created by the flow of electrons. When a small current flow through the base of the PNP transistor, it turns on. The current in a PNP transistor flows from the emitter to the collector.
Which transistor current is largest?
The emitter current is the largest, the collector current is the smallest, and the base and emitter currents are close.
Why is base current so small?
Small is relative term, current gain of the transistor decides how small base current would be than collector current. Most of the emitter current of electrons diffuses through the thin base into the collector. Moreover, modulating the small base current produces a larger change in collector current.
What is a hole current and an electron current?
so as to sum up, electron current is normal flow of electron , hole current is flow of empty electron states which are in turn filled by electrons only but flowing in opposite direction as that of normal electronic current ! [1] http://Z (https://www.halbleiter…
How does current flow in a NPN transistor?
The transistor is kind of like an electron valve. Click to see full answer. People also ask, which direction does current flow in a NPN transistor? In an NPN transistor, the flow 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.
How is the current of an electron determined?
Current is flow of electrons, but current and electron flow in the opposite direction. Current flows from positive to negative and electron flows from negative to positive. Current is determined by the number of electrons passing through a cross-section of a conductor in one second.
How is the collector current related to the hole current?
When emitter is open circuited, the emitter current is zero IE = 0 and therefore hole current in collector is also zero IpC = 0. In such condition, the collector-base junction JC acts as a reverse biased diode and the collector current IC is equal to the reverse saturation current or reverse saturation collector current ICO.