Electrical materials, Physics

Assignment Help:

Electrical materials:

Materials which allow an electric current to flow easily are known as conductors and those which prevent the flow of an appreciable current are known as insulators. Conductors and insulators are used in electrical circuits to provide paths for and to control the flow of, electric current. Practically all normal materials are either good conductors or good insulators. There are, however, a few materials which fall between these two categories and these are called semiconductors. Semiconductors will be studied in detail when we begin the electronics phase of the course.

The best electrical conductor is silver, but for most purposes its high cost is prohibitive so copper is the standard conductor material. Aluminium is an alternative, but it is not such a good conductor. Brass, which is harder than copper, is commonly used for terminals, switches etc. Tungsten and nickel are used in the construction of lamps and thermionic valves.


Related Discussions:- Electrical materials

Derive the Electric Field, Start from the expression of the electric field ...

Start from the expression of the electric field outside an infinite sheet of uniform surface charge density, E = s/2epsilon, derive the electric field just outside an ideal conduct

Electronics, tell the fixed transistor bias and describe the design

tell the fixed transistor bias and describe the design

Magnitude, A boat is traveling along a circular path having a radius of 20 ...

A boat is traveling along a circular path having a radius of 20 m. Determine the magnitude of the boats acceleration if at a given instant the boats speed is v = 5 m/s and the rate

Circuits involving capacitive decay, Circuits involving capacitive decay: ...

Circuits involving capacitive decay: Consider the circuit shown below. Depending on the time constant of the circuit, relative to the period of the square wave applied to it,

Capacitance, a 8 microfarad capacitor is charged to V=120V. the charging ba...

a 8 microfarad capacitor is charged to V=120V. the charging battery is then removed and the capacitor is connected in parallel to an uncharged 4 microfarad capapcitor. (a) what is

Two long wires, a) Two long wires, carrying currents i 1 and i 2 , are pla...

a) Two long wires, carrying currents i 1 and i 2 , are placed perpendicular to each other in such a way that they just avoid to contact. Determine the magnetic force on a small le

Evaluate the maximum work done, 10 moles of an ideal gas expands reversibly...

10 moles of an ideal gas expands reversibly and isothermally from a volume if 5 lit. to 50 lit. at 25°C. Find the maximum work done? Express the result in Joules.

Ac output resistance in common base configuration, AC  Output  Resistance  ...

AC  Output  Resistance  in  Common  Base  Configuration Ratio  of  change  in collector-base  voltage  ( ? V CB )  to  resulting  change  in  collector  current  ( ? I C )  at

Explain moment of inertia, Like the centre of mass, the moment of inertia i...

Like the centre of mass, the moment of inertia is a function of a body that is concurrent to its mass distribution. Moment of inertia gives a measurement of the resistance of a bod

What is avalanche breakdown, What is Avalanche Breakdown Minority ca...

What is Avalanche Breakdown Minority carriers, under reverse biased conditions, flowing through  the  junction  acquires  a  kinetic  energy  that increases  with  increase

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