Manufacturing of resistors , Physics

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.

Posted Date: 7/9/2012 4:12:16 AM | Location : United States







Related Discussions:- Manufacturing of resistors , Assignment Help, Ask Question on Manufacturing of resistors , Get Answer, Expert's Help, Manufacturing of resistors Discussions

Write discussion on Manufacturing of resistors
Your posts are moderated
Related Questions
(a) Potential energy : An electron operates some potential energy due to this found in the field of nucleus potential energy of electron in nth orbit of radius rn is given by


Fish soup is prepared in a hemispherical copper bowl of diameter 40 cm. The bowl is placed into the water of a lake to cool down and ?oats with 10 cm of its depth immersed.

why ballistic missile is unpowered and unguided

Compare and contrast the pattern which is seen with two coherently illuminated narrow slits in Young's experiment with that seen for a coherently illuminated one slit producing dif

Q. What would occur if a disk one light second in circumference were to spin at 60 RPM? Answer:- 60 revolutions for each minute is one revolution per second. 1 light se

state and explain malus law?

Two 1100-kg cars are travelling 95 km/h in opposite directions when they collide and are brought to rest. Estimate the change in entropy of the universe as a result of this collisi

create and sketch an equipment to conserve energy

a) Two charges of the value 15X10 -9 coulomb and 30X10 -9 coulomb are locate at a distance 6 cm. Determine the intensity of electric field at point which is at a distance 2 cm fro