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Types Of Resistors And Their Uses Pdf

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The main function of a resistor within an electrical or electronic circuit is to oppose or resist the flow of current, hence named as resistor. A fixed resistor is one for which the value of its resistance is specified or fixed and cannot be varied in general. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite similar to pencil lead and a non-conducting ceramic clay powder to bind it all together.

An ohm is an ohm, right? Not so fast — there are many different types of resistors. To insure that your circuit works and stays working, use the right type of resistor. In this article, you'll learn about the common types of resistors and their special characteristics.

Types of Resistors

The main function of a resistor within an electrical or electronic circuit is to oppose or resist the flow of current, hence named as resistor. A fixed resistor is one for which the value of its resistance is specified or fixed and cannot be varied in general. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite similar to pencil lead and a non-conducting ceramic clay powder to bind it all together.

The ratio of carbon dust to ceramic i. The mixture is then moulded into a cylindrical shape with metal wires or leads attached to each end to provide the electrical connection. Then finally it is coated with an outer insulating material and colour coded markings to denote its resistive value. They are much more accurate in value than carbon film resistors. A wire wound resistor is made of metal resistance wire, and because of this, they can be manufactured to precise values. Also, high-wattage resistors can be made by using a thick wire material.

Wire wound resistors cannot be used for high frequency circuits. Another type of resistor is the Ceramic resistor. These are wire wound resistors in a ceramic case, strengthened with a special cement.

These resistors can become extremely hot when used for high power applications, and this must be taken into account when designing the circuit. One example of its use is to control the current in a circuit powering many light emitting diodes LEDs. In the fig. Each of the leads on the package is one resistor. The ninth lead on the left side is the common lead. The 4S indicates that the package contains 4 independent resistors that are not wired together inside.

The housing has eight leads instead of nine. The other is semi-fixed resistor that is not meant to be adjusted by anyone but a technician. It is used to adjust the operating condition of the circuit by the technician. Semi-fixed resistors are used to compensate for the inaccuracies of the resistors, and to fine-tune a circuit. The rotation angle of the variable resistor is usually about degrees.

Some variable resistors must be turned many times multi-turn Pot to use the whole range of resistance they offer. This allows for very precise adjustments of their value. The four resistors at the center are the semi-fixed type. The two resistors on the left are the trimmer potentiometers. It is well suited to adjust a low sound subtly.

The rate of change is the same, or linear, throughout the sweep of the axis. This type suits a resistance value adjustment in a circuit, a balance circuit and so on. In the early stages of the rotation of the axis, the resistance value changes rapidly, and in the second half, the change occurs more slowly. Your email address will not be published. The symbol of resistor is shown in fig. Resistors can be broadly of two types.

Fixed Resistors Variable Resistors Fixed Resistors : A fixed resistor is one for which the value of its resistance is specified or fixed and cannot be varied in general. Example of fixed resistors are : Carbon Film Resistors : These are made of carbon dust or graphite paste and have low wattage values. Metal Film Resistors : These are made from conductive metal oxide paste and have very low wattage values.

Wire wound resistors : These resistors have metallic bodies for heat sink mounting and have very high wattage ratings. Carbon Film Resistors :- This is the most general purpose, cheap resistor used in electrical and electronic circuits. Carbon Film Resistor Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite similar to pencil lead and a non-conducting ceramic clay powder to bind it all together. Carbon Film Resistor The ratio of carbon dust to ceramic i.

The disadvantage of using carbon film resistors is that they tend to be electrically noisy. Metal Film Resistors :- Metal film resistors are used when a higher tolerance more accurate value is needed.

Nichrome Ni-Cr is generally used for the material of resistor. They have very high power ratings, from 1 or 2 watts to dozens of watts. Single-In Line Network Resistors :- It is made with many resistors of the same value, all in one package.

One side of each resistor is connected with one side of all the other resistors inside. Variable Resistors : There are two general ways in which variable resistors are used. One is the variable resistor whose value is easily changed. Posted on by Leave a comment. Leave a Reply Cancel reply Your email address will not be published.

Resistors: Types, Uses, Details

Resistors can be seen in almost all electronic circuits. There are many types of resistors and they can be divided into two groups namely fixed resistor and adjustable resistor variable resistor. The main function of the resistor is to resist the flow of electric current and regulate the flow of electrons. This is done by the material from which they are composed. They are mainly categorized on the basis of their applications, temperature coefficient, tolerance, size, power, reliability, voltage, etc. Fixed value Resistors : Fixed resistors are the type of resistors which offers a fixed amount of resistance in the circuit.

A wirewound resistor is an electrical passive device that limits or restricts current flow in a circuit. Wirewound resistors are constructed using a conductive wire. The conductive wire is then wound around a non-conductive core. The conductive wire can be made of varying alloys and thickness to control the resistance value. Wirewound resistors are typically used in high power and industrial applications such as circuit breakers and fuses. Ohmite's 20 Series axial terminal resistors are both durable and economical.

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages , bias active elements, and terminate transmission lines , among other uses. High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for generators. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements such as a volume control or a lamp dimmer , or as sensing devices for heat, light, humidity, force, or chemical activity. Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment.

Wire Wound Power Resistor

The property of a substance which opposes the flow of electric current or electricity through it is called Resistance OR Resistance is the ability of a circuit which opposes current. Mica, Glass, Rubber, Wood etc. Ohm is the measurement quantity of resistance, which produces one joule of energy in the form of heat in one second, when one ampere of current is flowing through it. The reciprocal of the resistance is called conductance. A resistor is a component or device designed to have a known value of resistance.

There is a broad range of resistors. In order to know the position of ROHM's resistors, we have attempted to classify not only based on the general materials used, but also in terms of the shape, integration level, and functions. This is the classification based on the functions of the resistors. The classification is made as fixed resistors and variable resistors, and, normally, the word "resistor" implies a fixed resistor. Variable Resistors: Variable resistors are composed of a fixed resistor element and a slider which taps onto the main resistor element.

Metal film resistors use a 4 digit numbering sequence to identify the resistor value instead of the color band scheme used for carbon types:. Carbon types are useful to about 1 MHz. Wirewound resistors have the highest inductance, and hence the poorest frequency response. What about temperature effects?

As the name implies, the resistance of the variable resistor is changeable. It is easy to vary or change the resistance of a variable resistor to a desired value. Variable resistors are mostly used when the user do not know what exact resistance value does he want.

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5 Comments

Lisa F. 14.05.2021 at 04:55

In fact the resistor is probably the most common type of electronic component used in electrical and electronic circuits.

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Resistors. Topics Covered in Chapter 2. Types of Resistors. Resistor Color size but different resistance values. Their end electrodes are soldered.

SalomГіn S. 18.05.2021 at 02:01

applications there values like power rating,R value, tolerance etc vary. Resistors of resistance value ranging from.1ohms to many mega ohms are manufatured.

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