Electrons are the majority charge carriers in N-type semiconductors and are beaten back by the negative terminal of the battery V EE in emitter current I E.From the circuit diagram, we find, I E = I B + I C.In the external circuit, current is due to flow of electrons. Current in this transistor is because of holes.When the hole combines with the electrons in the base, it is reimbursed by the flow of electrons from a negative terminal of the battery to the base through the wire.Collector current I C which is 95% of I E. The remaining 95% runs over to the collector base.Electron density is less, only 5% of holes enter the base with the electrons which show up to base current I B.The electrons are majority charge carriers in P-type semiconductors and are beaten back by the positive terminal of the battery V EE in emitter current I E.

Reverse Bias- N-type base is connected to the positive pole and the P-type base is connected to the negative pole of the same battery V CCĮmitter current I E, Collector Current, and the Base Current I BĮmitter-base has low resistance and base-collector junction has high resistance.

Reverse Bias- P-type base is connected to the negative pole and N-type emitter is connected to the positive pole of the same battery V CC.įorward Bias- P-type emitter is connected to the positive pole and N-type emitter is connected to the negative pole of the same battery V EE Working Difference between NPN And PNP Transistorįorward Bias- N-type emitter is connected to the negative pole and P-type emitter is connected to the positive pole of the same battery V EE. The direction of current is from Base to Emitter The direction of current is from Emitter to Base The minority of charge carriers are Electrons The minority of charge carriers are Holes. The majority of charge carriers are Holes. The majority of charge carriers are Electrons. It arises because of the flow of electrons. It improves and unfolds because of the diverse positions of electrons. The direction of Current is from Emitter to Collector The direction of Current is from Collector to Emitter It switches ON when holes enter into the base. It switches ON when electrons enter the base. Two P-type doped semiconductors are separated by N-type doped semiconductor material which is a thin layer. Two N-type layers are separated by one P-type thin layer.

Their arrangement is in a way that P-type doped semiconductor is separated by N-type doped semiconductor material which is a thin layer.ĭifference between NPN And PNP Transistors.

In these, holes are the major source that carries current, and electrons are minor.

PNP transistor is also a type of Bipolar Junction Transistor.

Emitter Current = Collector Current + Base Current.

Their arrangement is in such a way that N-type doped semiconductors are separated by the layer of P-type doped semiconductors which is a thin layer material embedded between them.

In this, electrons are major current carriers, and minor ones are holes.

NPN transistor is a type of Bipolar Junction Transistor.The video below explains this: Transistor Detailed Video Explanation: Transistors control the flow of current by regulating and controlling the voltage between two of the leads. These are special because they permit you to control the flow that flows through the circuit. It regulates, methodizes, and amplifies electrical signals such as current or voltage. Transistor is a semiconductor device that exchanges or transfers a weak signal from a sink resistance circuit to one.

Example npn transistor schematic