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
Mosley studied the characteristic X-ray spectrum of a number of a heavy elements and concluded that the spectra of dissimilar elements are very same and with enhancing atomic value

Conventional Current: Earlier scientists had no knowledge of the concept of electron, so the developed the convention, still in use, , that the direction of current is for appo

Illustrates the formula of Rayleigh-jeans law? RAYLEIGH-JEANS LAW The energy distribution into the thermal spectrum is specified by given formula as follows: E λ = 8Πk

composition of mosfet .

WHY HEATER IS KEPT IN CONTROL ROOM OF MRI? IS IT KEPT ON ALL THE TIME OR IT CAN BE TURNED OFF AT NIGHT AND RESTARTED AT MORNING

What is an animation harness? A group of fiber optics arranged into a sequential numbered and fashion. The fibers are after that installed in similar order and, with the help o

Coupled Harmonic Oscillators Two easy pendulums connected through a spring. The mass of one of the pendulums may be varied. Within mathematical rounding errors, the resolution

PRINCIPLES OF OPERATING DEPLETION MOSFET


Assume a crane lifts a 900 kilogram wrecking ball 12 meters above a concrete slab.  105,840 Joules of potential energy are kept in the wrecking ball.  Now the ball is dropp