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

Determine the speed of the motor, Q. A 10-kW, 250-V dc shunt generator, hav...

Q. A 10-kW, 250-V dc shunt generator, having an armature resistance of 0.1and a field resistance of 250 , delivers full load at rated voltage and 800 r/min. The machine is now ru

Mode 2 - boost converter, Mode 2 In this  mode transistor  gets turne...

Mode 2 In this  mode transistor  gets turned off by  the negative output  of PWM  current  flows  through  inductance L diode D then  divide into two  parts one flows through

Apparatus for BCD to excess 3, Apparatus for BCD to excess 3 convertor usin...

Apparatus for BCD to excess 3 convertor using nand and nor gates

Ac motors, If the stator windings of an alternator were to be supplied ...

If the stator windings of an alternator were to be supplied by an AC of frequency f (as opposed to drawing an AC current from them as would be the case for an alternator) then

Equivalent circuit of a dc machine, Equivalent Circuit of a DC Machine ...

Equivalent Circuit of a DC Machine A review of the material presented with regard to elementary direct-current machines can be helpful at this stage to recall the principles of

Project, Hello I am doing a Btec degree in Electrical and electronic engine...

Hello I am doing a Btec degree in Electrical and electronic engineering and I was wondering if you can help me complete it because I am behind

Load balancing and load management, Load Balancing and Load Management ...

Load Balancing and Load Management It has been observed in which the load on all three phases of a distribution line and between the feeders is not balanced. This output in in

What is the impulse response of this filter, Consider the filter h[n,m] des...

Consider the filter h[n,m] describing the input-output relationship below: g[n,m]=f[n-1,m]+ f[n,m-1]+ f[n+1,m]+ f[n,m+1] a)  What is the impulse response of this filter? b

Magnetic Circuits:, A circular ring of magnetic material has a mean length ...

A circular ring of magnetic material has a mean length of 1m and a cross sectional area of .001m^2.A sawcut of 5mm width is made in the ring . calculate the magnetizing current req

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