Transistors take in power through one set of connections. This power will change the way it takes in power through a second set of connections. Diodes take in power through one terminal and send it out through another, preventing power from moving backward through a system. While transistors and diodes are often found in the same device, they are performing totally different functions.
While transistors and diodes operate in a totally different way, they appear very similar. They are both comprised of paired terminals connected to a semiconductive material. They both take in power through one connection and let it out through another, and they both will cause slight changes in that power.
This is where the similarities between transistors and diodes end. The diode is made up of semiconductor material, and it is mainly used for rectification.
The conduction occurs in the circuit when the diode is forward bias. The forward bias means the P-type material is connected to the positive terminal of the battery and the N-type material is connected to the negative terminal of the battery. The block diagram of the diode is shown in the figure below. A transistor is a three-terminal device which is used for amplifying the electrical signals.
It is made up of semiconductor material. The emitter, collector and base are the three terminals of the battery.
The emitter junction is forward bias and offers a small resistance, whereas the collector junction is in reverse bias and offer a high resistance. When the weak signal is introduced to the low resistance circuit of the transistor, it transfers the signal from the high resistance circuit. If, however, the polarity of the battery is reversed, i. The holes are now attracted to the negative battery terminal and move away from the junction because of the attraction of the positive terminal.
Since there are effectively no hole and electron carriers in the vicinity of the junction, current flow stops almost completely. By exploiting their property of one way flow of electric current, they can be utilized to convert alternating current to direct current known as rectification.
Without adequate filtering, the resultant d. The simplest of the transistors are of two types-either p-n-p or n-p-n. Two p-n junction diodes can be sandwiched back to back to form a p-n-p or n-p-n junction transistor. But in a practical transistor, the center or n-type portion of the sandwich is extremely thin in comparison to the p-regions.
In the 1st illustration, both the p-n junctions are reverse biased. In this type of connection, holes in the each of p-region are attracted towards the negative battery terminal and the mobile electrons in the n-region are initially moved away from both junctions in the direction of the positive battery terminal. Due to the displacement of holes and electrons, there will be no current flow in the external circuit. In the 2nd illustration, one of the p-n junctions is forward biased, while the other is reversed biased.
A collector is the third region of the transistor and has a large area than the other two since it can dissipate heat generated at the base-collector junction. That is a detailed post about the difference between diode and transistor if you have any query ask in comments. Thanks for reading. I am a professional engineer and graduate from a reputed engineering university also have experience of working as an engineer in different famous industries.
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