Manufacturing of resistors , Physics

Assignment Help:

The following steps are taken in the manufacturing of a resistor:

(1)         PREPARATION OF SUBSTRATE: Substrate should hold the resistive element. It should be a good insulator. The overall characteristics of resistors are highly dependent upon that of substrate. Ceramic such as steatite, porcelain, mullet, forsterite, and alumina are used as substrates. Advantages of using ceramics as substrate are that they can be shaped into desired dimensions and coefficients of linear expansion can be matched with the resistive element on top of it. It has good mechanical strength and can withstand high temperatures.

(2)         PREPAREATIONS OF RESISTIVE ELEMENT: Generally used resistive materials are metal alloys, carbon and graphite with binders. The resistance wire used has lower temperature coefficient. Nickel-copper, nickel-chromium and nickel-aluminium are the materials frequently used. Resistive materials may be in the form of film or slug.

(3)         END CONNECTIONS OR TERMINAL FITTING: Terminals are used to make electrical connections of the resistive element to the circuit. This is done by using wire leads and metallic lugs. Terminals can be fitted either axially or radically by press fitting, welding or soldering.

(4)         PROTECTIVE COATING: The protective coating is applied on resistance element to provide protection against mechanical and environmental forces. By choosing proper coating material, the resistor can withstand higher temperatures. Cement mixed with binds, virtuous, enamel or silicon and generally used as protective coating material.

(5)         COLOR COADING OF BAND: Resistors use a pattern of collared strips to point out resistance value, tolerance and other ratings. Then they are finally packed.


Related Discussions:- Manufacturing of resistors

Fire accident in an industry?, If there is a fire accident in an industry, ...

If there is a fire accident in an industry, what  a safety enginner  will do? Ans) Normal 0 false false false EN-IN X-NONE X-NONE

Mica is a which type of material, Mica is a (A) Dielectric material. (...

Mica is a (A) Dielectric material. (B) Insulating material. (C) Magnetic material. (D) Both insulating and dielectric material. Ans: Mica is a both insulating and

Rayleigh''s criterion of just resolution of two spectral line, Q.  Explain...

Q.  Explain Rayleigh's criterion of just resolution of two spectral lines of equal intensities giving suitable intensity distribution carves. Show how the resolving power of a pla

Physics, Current time base generator

Current time base generator

Determine the dynamic resistance, A coil of resistance 1.5k Ω and 0.25H ind...

A coil of resistance 1.5k Ω and 0.25H inductance is connected in parallel with a variable capacitance across a 10V, 8kHz supply. Calculate (a) the capacitance of the capacitor

What are fitting, What are fitting? Practically the only part of a fibe...

What are fitting? Practically the only part of a fiber optic system which the public ever notices. End fittings are the components for fixing, supporting, finishing and aiming

Capacitance, Capacitance: If we increase the voltage between the plates...

Capacitance: If we increase the voltage between the plates, the charge increases, but the ratio of charge to voltage remains the same.  This ratio gives the capacitance (C)  of

Explain kirchoff"s current law, Kirchoff"s Current Law states that in any ...

Kirchoff"s Current Law states that in any electrical network, the algebraic sum of the currents  meeting at a point (or junction) is zero, which means that the total current leavi

Giger muller counter (g.m tube), Giger Muller counter (G.M tube) the op...

Giger Muller counter (G.M tube) the operation principle of G.M tube is even small amount of ionization produced by single beta ray entering the tube can trigger discharge ,prod

Reduce the expression for expected fringe shift, Deduce the expression for ...

Deduce the expression for expected fringe shift in Michelson Morley experiment. Discuss the result of experiment.

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