Introduction For Resistors

Definition Resistors
Resistors are electronic components of the two channels are designed to withstand an electric current by producing a voltage drop between the two channels in accordance with the current flowing, according to Ohm's law:

V = I x R

I = V / R

Resistors are used as part of electronic networks and electronic circuits, and is one of the most frequently used components. Resistors can be made from a variety of compounds and movies, even the wire resistance (wire made from high resistivity alloys such as nickel-chromium).

The main characteristics of the resistors is the resistance and the electrical power that can be wasted. Other characteristics include temperature coefficient, electrical sighed, and inductance.

Resistors can be integrated into hybrid circuits and printed circuit boards, integrated circuits even. The size and location of the foot depends on the design of circuits, resistors must be physically large enough so as not to overheat while wasting resources.

Units

Ohm (symbol: Ω) is the SI unit for electrical resistance, named after George Simon Ohm. Usually used the prefix miliohm, kiloohm and megaohm.


Construction RESISTOR
Carbon composition
Carbon composition resistors consist of a tubular resistive element with a wire or metal lid on both ends. Resistor body is protected with paint or plastic. Old carbon composition resistors have not isolated entities, wire wrapped around the end of the resistive element and then soldered. Resistors which have become painted with the color code of the price.

Resistive element is made from a mixture of carbon powder and insulating material (usually ceramic). Resin is used to embed the mix. Resistance is determined by the ratio of carbon powder with insulating material. Carbon composition resistors are often used before the 1970s, but now not so popular as other types of resistors have better characteristics, such as tolerance, self-reliance against stress (carbon composition resistors change resistance when subjected to more stress), and the independence of the stress / strain . In addition, if the resistor becomes damp, heat from the solder can lead to changes in resistance that can not be refunded.

However, these resistors are very reliable if never given overvoltage or overheating.
This resistor is still produced, but relatively quite expensive. Resistance ranges from several miliohm to 22 MOhm.

The composition of the carbon film
Layer of carbon film deposited on a layer of insulator substrate, and cuts made to form a spiral resistive path long and narrow. By changing the width of cut lines, coupled with a resistivity of carbon (between 9 to 40 μΩ-cm) can provide a wide resistance. Carbon film resistor power rating between 1 / 6 W to 5 W at 70 ° C. Resistance is available from 1 ohm to 10 MOhm. Resistor carbon film can work at temperatures between -55 ° C to 155 ° C. It has a maximum working voltage of 200 to 600 volt.

The composition of the metal film
The main resistive element of foil resistors is a special alloy metal foil as thick as several micrometers.
Foil resistors are resistors with precision and best stability. One of the important parameters influencing stability is the temperature coefficient of resistance (TCR). TCR of foil resistors is very low. Ultra-precision foil resistors have a TCR of 0.14ppm / ° C, tolerance ± 0005%, long-term stability 25ppm/tahun, 50ppm / 3 years, the stability of the load 0.03% / 2000 hours, heat 0.1μvolt EMF / ° C, sigh-42dB, voltage coefficient of 0.1ppm / V, 0.08μH inductance, capacitance 0.5pF.

MARKING RESISTOR
Axial Resistors typically use a color banding pattern to indicate resistance. Resistor pairs numerically ditandas-surface if large enough to be marked, usually small size resistors are now used is too small to be marked. Packaging is usually light brown, brown, blue, or green, although other colors are also possible, such as dark red or gray.

Resistors beginning of the 20th century is usually not isolated, and dipped into the paint to cover the entire body for color coding. Given a second color on one end, and a point (or ribbon) colors in the middle to give the third digit. The rule is "the body, tip, point" gives the order of two decimal digits of the resistance and the multiplier. Basically tolerance is ± 20%. Resistors with a tolerance that is more tightly using silver color (± 10%) or gold (± 5%) on the other end.

Identification of four bands
Identification of four ribbons are color coded scheme the most frequently used. It consists of four color printing ribbon surrounds the resistor body. The first two bands are two-digit price information resistance, the third band is the multiplier (number of zeros are added after the two-digit resistance) and the fourth is the tolerance of the price band of resistance. Sometimes a fifth band indicates the temperature coefficient, but this must be distinguished from a true color system that uses five three-digit resistance.

For example, green-blue-yellow-red is 56 x 104Ω = 560 kΩ ± 2%. Easier description is: The first tape, green, has a price of 5 and a second ribbon, blue, has a price of 6, and both are counted as 56. The third tape, yellow, has a price of 104, which added four zeros in the back 56, while the fourth ribbon, red, is the code for the tolerance of ± 2%, giving 560.000Ω value on the accuracy of ± 2%.

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Basic Electronic Components

According to my promise in my previous post which is about the Electronics Introduction. This time Learning Place Online will discuss the Basic Electronic Components.

The Basic Electronic Components are Electronic Components that are very often used in Electronic Circuits. These Components are ususlly made of cramic materials ( Resistors, Capasitors, etc...). With the development of the age, then these component periodecally reduced in the manufacturing of Electronic Circuits are very complicated so that is now finding a replacement component which consicts of basic component of clusters that have been united. replacement component is called IC (Integreted Circuit). But the basic components remain desperately needed to offset the IC for the incoming cirrent and voltage in the circuit remains stable.

Electronic Componen is Two :
1. Acrive Components
2. Passive Components

Active Components
The definition of the active component is a component of the electronic component that if the electricity will produce a good energy in the form of strengthening and regulating the flow of electricity through it. some of which include active components include : Diodes, Transistor, Thyristor or SCR, TRIAC, Integreted Circuit (IC).

Passivve Components
The definition Of passive components are electronic Components that if electricity is not producing power, Such as : Changes in Voltage, Phase reversal, strengthening etc....

Until here first Learning Place Online article about the Basic Electronic Components. explanation of the Basic Electronic Components will be discussed one by one in the next Learning Place Online article. See you at the next post...

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Electronics Introduction

In everyday life we meet a lot of elctronic tools that adopt the technology as the basis for example, at home, we often look at television, listen to song via tape or CD, listen to the radio, communicating with the telephone. our office uses a computer, printing with a printer, send massages to faxes, communicate with the telephone.

In the factory we use the detection device, oprating the robot builders, and so forth. event the way of highway we could see traffic lights, street lighting, which automatically alive at night, or a billboard that looks beutiful twinkling and there are many other examples.

Of all descriptions above we can prove that in this day and age we kill not be separated from the devices that use electronics as the basic technology. the tools that use the basic electronics work as above is usually reffered to as electronics equipment (Electronics Devices).

Electonics is the study of weak curent electrical appliance whitch is operated by way of controlling the flow of the electrons or electrically charged particles in a device such as computers, electronics equipment, thermocoiples, semiconductors, and so forth. science of learning tools such as this is a branch of physics, while the form of design and manufacture of electronic circuits is part of electrical enginering, computer engineering , and science / electronics and instrumentation engineering.

Just got here before the  Electronics Introduction in the Learning Place Online this time. in the future i will discussthe basic electronic components. until we meet again in the nest post

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Computers and the Inventors

What is a computer...???

A computer is a device that accepts information (in the form of digitalized data) and manipulates it for some result based on a program or sequence of instructions on how the data is to be processed. Complex computers also include the means for storing data (including the program, which is also a form of data) for some necessary duration. A program may be invariable and built into the computer (and called logic circuitry as it is on microprocessors) or different programs may be provided to the computer (loaded into its storage and then started by an administrator or user). Today's computers have both kinds of programming.

The term computer is derived from the Latin term ‘computare’, this means to calculate.Computer can not do anything without a Program.it represents the decimal numbers through a string of binary digits. The Word 'Computer' usually refers to the Center Processor Unit plus Internal memory

Computer is an advanced electronic device that takes raw data as input from the user and processes these data under the control of set of instructions (called program) and gives the result (output) and saves output for the future use. It can process both numerical and non-numerical (arithmetic and logical) calculations.The basic components of a modern digital computer are: Input Device,Output Device,Central Processor. A Typical modern computer uses LSI Chips.

Who is the inventor of the computer...???

Most histories of the modern computer begin with the Analytical Engine envisioned by Charles Babbage following the mathematical ideas of George Boole, the mathematician who first stated the principles of logic inherent in today's digital computer. Babbage's assistant and collaborator, Ada Lovelace, is said to have introduced the ideas of program loops and subroutines and is sometimes considered the first programmer. Apart from mechanical calculators, the first really useable computers began with the vacuum tube, accelerated with the invention of the transistor, which then became embedded in large numbers in integrated circuits, ultimately making possible the relatively low-cost personal computer.

Modern computers inherently follow the ideas of the stored program laid out by John von Neumann in 1945. Essentially, the program is read by the computer one instruction at a time, an operation is performed, and the computer then reads in the next instruction, and so on. Recently, computers and programs have been devised that allow multiple programs (and computers) to work on the same problem at the same time in parallel. With the advent of the Internet and higher bandwidth data transmission, programs and data that are part of the same overall project can be distributed over a network and embody the Sun Microsystems slogan: "The network is the computer."

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