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"Types of Resistors"

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shena mae cas

on 30 July 2013

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Transcript of "Types of Resistors"

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TYPES OF RESISTORS
Like many electronic components, resistors come in a variety of shapes, sizes, capacities and types. All resistors are not created equal, however. Each type of resistor has significant differences in typical values for resistor noise, tolerances, wattage rating, temperature coefficient, voltage coefficient, frequency response, size, and reliability. These differences bring advantages and limitations making some resistors ideal in some applications and a source of troubleshooting nightmares in others.
1. Fixed Value Resistor
2. Variable Resistor or
Potentiometer
3. Package Resistor
1. Carbon Composition
2. Non Linear Resistor
-> are those types of resistors in which the Current passed through it is not exactly directly proportional to the Potential Difference applied to it. These types of resistors have non-liner V-I characteristics and does not strictly follows ohm’s Law.
-> are those types of resistors whose value is fixed already while manufacturing and cannot be changed during it’s usage.
-> are those types of resistors whose Value can be changed during it’s usage.
-> these types of resistor usually contains a shaft which can be rotated or moved by hand or a screw driver to change it’s value in between a fixed range for eg. 0 Kilo Ohms to 20 Kilo Ohms.
-> is a resistor which contains a package which contains two or more resistors inside it.It have many terminals and the resistor’s resistance can be chosen by using any two terminals among the available terminals or can also be used as an resistor array for various purposes.
-> are made by a composition of Carbon Particles which are hold together by a binding resign. The proportion of carbon particles and resign used determines the value of the resistor. At both ends of the composition a Metal Cap with a small rod of tin is attached to solder it or use it in circuits , then the whole package is enclosed in a plastic case to prevent moisture and reaction with air.
Based on Resistor’s Value:
1. Linear Resistor
-> is the type of resistor whose resistance remains constant with increase in the potential difference or voltage applied to it.
Based on Conductive properties of Resistor:
Based On Composition:
2. Carbon Film Resistors
->is a resistor in which a thin film of carbon is deposited onto an insulated substrate and then cut into a spiral body.
The resistance value of the resistor is controlled by varying the proportion of carbon to insulator. More carbon gives less resistance, while more insulating material gives greater resistance.
3. High Voltage Ink Film
->are made by coating a special resistive ink in a helical band above a ceramic base. These resistors can withstand very high voltage of up to one thousands of kilo voltages and usually have high resistance too ranging from on kilo ohms to one hundred thousand mega ohms.
4. Metal Film Resistor
->a resistor in which a thin film of metal is sprayed onto a ceramic substrate and then cut into a spiral body.
It offer more precise resistance values than the other type of film resistors, which are carbon-film resistors. Like carbon-film resistors, metal-film resistors are affected very little by temperature changes and aging. They also generate very little noise internally.
5. Thick Film Resistors
->are common surface mount resistors even today. They are made in a screen printing process using a conductive ceramic and glass mixture composite suspended in a liquid.
6. Thin Film Resistors
->are made by through a vacuum deposition process called sputtering where a thin layer of conductive material is deposited on an insulating substrate. This thin layer is then photo etched to create a resistive pattern.
Based on functions:
1.Power Wirewound Resistors
->are resistors that can handle a large amount of power, usually up to 50 watts.
Typical resistors normally can handle between 0.25W to 2W of power. Power wirewound resistors can handle much, much more and are suitable for use in high-power applications.
2. Precision Resistors
->are resistors that have very low tolerance values, so they are very precise (closely near their nominal value).
It have very low tolerance percentage values, making them ultraprecise to their nominal values. They will vary very little from their nominal values, so they are used in applications where high-precision is necessary in terms of resistance values.
3. Fusible Resistor
->is a wire-wound resistor that is designed to burn open easily when the power rating of the resistor is exceeded.
In this way, a fusible resistor serves dual functions. When the power isn't exceeded, it serves as a resistor limiting current. When the power rating is exceeded, it functions as a fuse, burning up, and becoming an open in the circuit to protect components in the circuit from excess current.
4. Cement Resistors
->are power resistors that are heat and flame resistant.
Cement resistors are made to handle a large amount of power flowing through it with it being undamaged by heat or flames. If you are designing a circuit where a lot of current is being passed through a resistor and with it needing to be resistant to high heat and flame, cement resistors is a good design choice.
5. Potentiometers
->is a 3-terminal variable resistor. Potentiometers are in wide use in circuits for a variety of uses, but their main fuction remains the same: to increase or decrease the amplitude of a signal in a circuit. When the resistance of the potentiometer is decreased, the amplitude of the signal increases. When the resistance is increased, the amplitude of the signal decreases. This can be used in circuits to control volume levels such as on speakers or for any adjustable controls.
6. Rheostats
->is a 2-terminal variable resistor. Rheostats serves to vary the amount of voltage or current in a circuit. It can be used to vary AC or DC signals. It is connected in a circuit by having the two leads connected in series with the load.
7. Thermistors
->is a thermally sensitive resistor whose resistance value changes with changes in operating temperature.
Because of the self-heating effect of current in a thermistor, the device changes resistance with changes in current.
Thermistors are frequently used in electronic circuits that handle temperature measurement, temperature control, and temperature compensation.
8. Photoresistors
->are resistors whose resistance values change according to the light striking the surface of the resistor. Thus, photoresistors are variable resistors whose resistance values change in regard to the amount of light hitting its surface.
Cas, Shena Mae L.
BS in Computer Engineering III
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