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leadatomic number82symbolpbatomic weight207.2discoveryknown since prehistoric timeelectronic configuration6p2properties 1. it is
platinumatomic number78symbolptatomic weight195.09discoveryolloa 1735electronic configuration5d9melting point17750celectrical resistivity10.910-8
mercury atomic number80symbolhgatomic weight200.59discoveryknown to the ancient hindus and chinese. mercury has
tungstenatomic number74symbolwatomic weight183.85discoverypurified tungsten in 1783.electronic configurationxe 6s2 4f14 5d4word originswedish
carbonatomic number6symbolcatomic weight12.011discoverycarbon exists free in nature and has been known since prehistoric time.electronic
acsr aluminium conductor steel reinforcedowing to the low tensile strength of aluminium aluminium conductors produce greater sag which prohibits
aac all aluminium standard conductorsstandard conductors are the conductors made of thin wires of small cross-section and bunched together. they are
steel steel contains iron with a small percentage of carbon added it. iron itself is not very strong but the additions of small percentage of carbon
beryllium copper alloy it is obtained by alloying copper and beryllium. these alloys containing beryllium up to 2.75 can be produced in the form of
bronze copper when alloyed with tin 8 to 16 and a very small percentage of a third element like cadmium beryllium phosphorous silicon etc is called
brass when copper is alloyed zinc 60 copper 40 zinc is called brass. it is widely used as a current carrying and structural material in switches and
gold atomic number79symbolauatomic weight196.9665discoveryknown since prehistoric
silver symbol agatomic weight107.868 atomic number 47discoveryknown since prehistoric time. man learned to separate silver from
aluminium atomic number13symbolalatomic weight26.98154discoverywohler 1827electronic configurationne 3pword originlatin alumen alum an astringent
copper atomic number29symbolcuatomic weight63.546discoverycu has been known since prehistoric time. it has been mined for more than 5000
high resistive materialsthe materials which have their resistivity 10-8 to 10-6 ohm-m come under this category. these materials are used for making
low resistivity materials the conducting materials having resistivity between 10-8 to 10-6 ohm-m come under this category and are used in house
classification of conducting materialselectrical resistivity of a conducting material or conductor ranges from 10-8 to 10-3 ohm-m. a good conducting
mechanical stressing when a material undergoes a mechanical treatment its resistivity changes due to mechanical distortion of the crystal structures.
alloying when an impurity atom of a different size compared to the host atom is placed into the crystal lattice the impurity atom distorts the resin
temperaturewhen the conduction electrons are only scattered by thermal vibrations of thermal ions then tau in the mobility expression refers to the
resistivityresistance may be defined as that property of a substance which opposes or restricts the flow of current or electrons through it. the
classical free electron theorythe free electron theory of metals using classical laws was developed by dude and lorentz in the beginning of last
q. compare pot furnace and tank furnace used in manufacture of glass.ans.s.no.pot furnacetank furnace1.used for special glasses optical glasses
q. describe the manufacturing process of glass.ans. manufacturing process of glass1. melting raw materials in proper properties