Metals, semiconductors, and insulators, Electrical Engineering

Assignment Help:

Metals, Semiconductors, and Insulators

  1. For electrons to move within an applied electric field there have to be states available to them.
  2. A totally filled band cannot contribute to current transport; neither can a totally empty band.
  3. So, semiconductors at 0 K are perfect insulators.
  4. With thermal or optical excitation, a number of these electrons can be excited from the valence band to the conduction band, and after that they can contribute to the current transport process.
  5. At temperatures other than 0 K, the magnitude of the band gap take aparts an insulator from a semiconductor, for example at 300 K, Eg(diamond) = 5 eV (insulator), and Eg (Silicon) = 1.12 eV (semiconductor).
  6. Number of electrons presented for conduction can be increased greatly in semiconductors via reasonable amount of thermal or optical energy.
  7. In metals, the bands are either partially filled or they overlap => so, electrons and empty states coexist => great electrical conductivity.

Related Discussions:- Metals, semiconductors, and insulators

Metering technologies, Metering Technologies An electric meter or ener...

Metering Technologies An electric meter or energy meter is a device in which measures the amount of electrical energy supplied to customers of an electric supply company. Elec

Customer indexing, Customer Indexing: Customer indexing (CI) is a meth...

Customer Indexing: Customer indexing (CI) is a method for enumerating the total number of consumers in a utility and tagging them to their respective poles, transformers and f

Dc generator, Why dummy coil is used in wave winding porpose of dc generato...

Why dummy coil is used in wave winding porpose of dc generator

Transistors, what is transistor how it works?

what is transistor how it works?

Metal oxide field effect transistor, Metal Oxide Field Effect Transistor ...

Metal Oxide Field Effect Transistor The metal-oxide-semiconductor field-effect transistor (MOSFET/MOS-FET/MOS FET) is a device employed for amplifying or for switching electr

Define multiplexing, 1 Explain the advantages and disadvantages of optical ...

1 Explain the advantages and disadvantages of optical fiber versus copper Medium of communication 2 Define multiplexing. Explain TDM 3 Describe the protocol architecture and

Potentiometer, explain the details of varnier type potentiometer

explain the details of varnier type potentiometer

Elucidate the process of inter-register signalling, Q. Elucidate the proces...

Q. Elucidate the process of inter-register signalling. Ans: Registers are used in common control exchanges to store as well as analyze routing data. They are provided on a

Thyristor - power semiconductor devices , Thyristor The name thyristor...

Thyristor The name thyristor  is derived bya  combination of the  capital  letters from  thyratron and  translstor. This means that thyristor is a solid  state device like  a

Fixed bias with emitter resistor, Fixed bias with emitter resistor: ...

Fixed bias with emitter resistor: Figure: Fixed bias with emitter resistor The fixed bias circuit is changed through attaching an external resistor to the emitter

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd