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cermets are a hybrid mixture of ceramic and metal. these are made by screening a mixture of glass and metal oxide on to a ceramic substrate. it is
manufacturing two processes are used manufacturing.coated film a mixture of carbon filler and binder is coated on a ring of insulating material. the
the variable resistor is a resistor whose value can be accustomed by turn a shaft or sliding a control. they are also referred to as potentiometers
for higher current rating application resistance wires with extremely large cross sections are required. the necessary large cross sections are
these resistors are usually of carbon composition carbon film on a ceramic rod and sealed in evacuated glass tube. end connections are made up of
manufacturing the resistance element is used as a wire made from special alloys which have small low temperature coefficient and good stability
manufacturing nickel film is deposited on ceramic substrate. this is done by electrolytic deposition of nickel in a chemical bath containing
manufacturingpure carbon is deposited on ceramic substrate by thermal decomposition of hydrocarbon at 10000c. the sheet resistance of film is
manufacturingresistive element is prepared in carbon composition but the filler used is ceramic powder. the sheet resistance is controlled by
manufacturing these resistors do not require substrate. resistive material is a mixture of finally ground graphite filter and resin blander. filter
the fixed value resistors are those whose resistance are fixed and cannot be changed. the fixed resistors can be further subdivided into following
the following steps are taken in the manufacturing of a resistor1 preparation of substrate substrate should hold the
depending on the material of the resistance element resistors are classified into linear resistors and non linear resistors. majority of the
a resistor is a two-terminal electrical or electronic component that resists an electric current by producing a voltage drop between its terminals in
surface mount devices smds are new components designed with soldering pads or short leads. they are much smaller in size as compared to leaded
double sided printed circuit boards are used where a complex circuit with more number of ics is to be accommodated. for preparing double sided pcb
in single sided pcb the conductor tracks run only on one side of copper clad board. thus crossing of conductors is not permitted. base material
the copper clad laminate manufacturing process is formed in heated press which has highly polished stainless steel press plates. the manufacturing
there are two most popular types of pcb as
materials the basic ingredients of a copper clad laminate arefillerresincopper foilfiller fillers are incessant webs of materials like paper glass
introduction a printed circuit board pcb is a sheet of insulating material usually bakelite with metallic circuitry photo chemically formed upon
shape memory alloys a group of metallic materials that can return to some previously defined shape or size when subjected to the appropriate thermal
fullerene the fullerene is a cage like hollow molecules composed of hexagonal and pentagonal groups of atoms and especially those formed from
an inter metallic compound having the chemical formula a3b where a represents a transition element and a crystal structure in which the b atoms are
electrical machines efforts are being made at present to develop electrical machines and transformers utilising super conductivity calculators. it