technology gain

Transformer is a statics device which is used for transfer the electrical power from one circuit to another circuit without change in frequency and it’s work on the fraday’s law of mutal induction .   1.  According to construction there are two types of transformer- core type and shell type.      2. Generally there are five types of transformer according to services- instrument transformer , step up transformer and step down transformer, single phase and three phase transformer, Power transformer, Distribution transformer.   Core type- In the core type transformer on the two core limb. it has only  one magnetic circuited or magnetic flux path . It is used for lower voltage level applications. It has less mechanical protection to coil . Here losses is more than the shell type transformer. maintenance and repairing of this transformer is very simple. It has two limbs . natural cooling is provided since more surface is exposes to atmosphere. shell type- In s

conductor\semiconductor\insulator\energy_ band_gap_theory Metal(conductor) - They posses very low resistivity (high conductivity) . Or Which type of material easily electric current passes through it.    Ex-Gold(Au), silver(Ag), copper(Cu) ,Aluminium(Al) etc.             Note - Silver is the best conductor of electricity. Insulator –They have high resistivity (low conductivity). or which type of material electric current does not passes through it. Ex-rubber, plastics, wood etc . Semiconductor -It is a material which electrical current partial passes through it. They have resistivity or conductivity intermediate to metal(conductor)and insulator.      EX- 1. Elemental Semiconductor: Si and Ge .              2.compound semiconductor:                               inorganic - Cds , GaAs , CdSe , InP etc.                               organic – Anthracene , doped pthalocyanines etc                               organic polymers- polypyrrole,polyaniline etc. N