THE WORLD OF ELECTRONICS

  Hey guys i'am here again to share my knowledge about the ""P-N JUNCTION DIODE". When the N-type semiconductor and P-type semiconductor materials are first joined together a very large density gradient exists between both sides of the PN junction. The result is that some of the free electrons from the donor impurity atoms begin to migrate across this newly formed junction to fill up the holes in the P-type material producing negative ions. However, because the electrons have moved across the PN junction from the N-type silicon to the P-type silicon, they leave behind positively charged donor ions (  N D  ) on the negative side and now the holes from the acceptor impurity migrate across the junction in the opposite direction into the region where there are large numbers of free electrons. As a result, the charge density of the P-type along the junction is filled with negatively charged acceptor ions (  N A  ), and the charge density of the N-type along the junct...

  BATTERY. H ey guys !!! I'm back with another interesting and important device which is used by all of us in one or another way . So here i star with "   THE BATTERY "    A battery is a device consisting of one or more electrochemical cells with external connection for powering electrical device such s flash lights ,mobile phones and and electric cars.When a battery supplying electric power its positive terminal is the cathode and the negative terminal is the anode .The terminal marked negative is the source of electrons that will flow through an external electric circuit to the positive terminal . When a battery is connected to an external electric load , Redox reaction converts high energy reactants to lower energy products and the free energy difference is delivered to the external circuit as electrical energy . Historically the term battery specially referred to a device composed of multiple  cells ,however the usage has evolved to include devices composed ...

  TRANSISTORS..... So here again i'm back with a knowledgeable blog related to one more wonder in the world of electronics .i.e. "THE TRANSISTORS". JUNCTION TRANSISTOR . A junction transistor is formed by sandwiching a thin wafer of one type of semiconductor between two layers of another type . The  n-p-n transistor has a p type wafer between two n type layers . Similarly the p-n-p transistor has a n-type wafer between two p-type layers.  (i) p-n-p transistor :    working: let us consider pnp transistor in common base mode.Since emitter-base is forward biased holes move toward base. Few of them combine with electrons in the base and  rest go to the collector .Since base-collector is reverse biased holes coming from base move toward the terminal of collector . They  combine with equal number of electrons entering from collector terminal (ii) n-p-n transistor:                          ...