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uses of transistorin a transistor the base current it plays a significant role in the collector current ic a small change in the base current forms a
transistoran active semi-conductor device with three terminals that is emitter base and collector is known as transistortypes of transistorthere are
rectifierrectifier is a device that converts all alternating current or voltage into direct current or voltage is known as
reverse biaswhen p-types material of a semi conductor diode is linked a negative potential and the n-type material is linked at positive potential of
forward biaswhen p-type material of a semiconductor diode is linked at positive potential and the n-type material is linked at negative potential of
biasingthe application of electric potential to semiconductor diode is known as
pn-junction diodeintroductionan electronic device which is made by linking together p-type semi-conductor and n-type semiconductor is known as p-n
dopingsilicon and germanium have low values of electrical conductivity because of few free electrons in order to improve the electrical conductivity
p-type substancewhen a small quantity of boron or indium group iii a elements is added to silicon or germanium holes are formed in it and it becomes
n-type substanceswhen a small quantity of arsenic or phosphorous group va elements is added to silicon or germanium it becomes good conductor of
semi conductorssubstance which are neither good conductor like metals nor very bad conductors like non metals are known as semi conductors examples
electrical bell1an electromagnet which is made by winding insulated copper wire on a soft iron core2an armature which is soft iron strip with
electric motora device which converts electric energy into mechanical energy is known as electric motorfactors on which the speed of rotation of
hard ferromagnetic substancesthose substances that do not lose their magnetism or removing from magnetic field are known as hard magnetic substance
soft ferromagnetic substancesthose substances that lose their magnetism are known as soft magnetic substances such as soft
ferromagnetic substancea substance which behaves as a magnet in presence of a strong magnetic field is known as ferromagnetic substanceeg iron
voltmeteran electromechanical instrument which is used to calculate potential difference among two points is known as voltmetervoltmeter is a
ammeteran electromechanical instrument which is used to calculate the amount of current flowing by an electric circuit is known as an ammeterit is
galvanometer1 an electromechanical instrument which is used to detect the presence of current in a circuit is known as galvanometer2 the major parts
factors on which magnetic force dependsthe magnetic force depends on following factors1 nature of pole like poles repel each other and unlike pole
methods of demagnetization1 a magnet loss its magnetic properly when it is heated strongly2 practically a magnet can be demagnetized by hammering
method of making magnetthere are two types of making magnetssingle touch methoda in this method a bar magnet is rubbed on a hard steel barb the
right hand rulejames clark maxwell proposed a rule to search the direction of magnetic lines of force around a wire carrying current this rule
electromagnetisma temporary magnet formed by winding a coil of insulated copper wire around a piece of shift iron is known as electromagnet when
magnetism1 there are two types of magnetic pole north and south2 like poles repel and unlike pole attract each other3 magnetic substance produce