Resistor & Types of Resistors | Categorize via Fixed, Variable, Linear & Non-Linear Resistors
Table of Contents
- 1 Resistance:
- 2 Resistor
- 3 Symbols of Different Types of Resistors. IEEE & IEC symbols of Resistors
- 4 Types of Resistors
- 5 1. 1. 1) Carbon Composition Resistors
- 6 1. 1. 2) Wire wound Resistors
- 7 1. 1. 3) Thin Film Resistors
- 8 1. 1. 3. 1) Carbon Film Resistors
- 9 1. 1. 3. 2) Metal Film Resistors
- 10 1.1.4) Thick Film Resistors
- 11 188.8.131.52) Metal Oxide Resistors
- 12 184.108.40.206) Cermet Oxide Resistors
- 13 220.127.116.11) Fusible Resistors
- 14 1. 2) Variable Resistors
- 15 1.2.1) Potentiometers
- 16 1.2.2) Rheostats
- 17 What is the main Difference between Potentiometer and Rheostats?
- 18 1.2.3) Trimmers
- 19 2. Non Linear Resistors
- 20 2.1) Thermisters
- 21 2.2) Varisters (VDR)
- 22 2.3) Photo Resistor or Photo Conductive Cell or LDR (Light Dependent Resistors)
- 23 2.4) SMD (Surface Mount Technology) Resistors
- 24 Uses / Application of Resistors
Mica, Glass, Rubber, Wood etc. are the examples of resistive materials. The unit of resistance is OHM (Ω) where 1Ω = 1V/1A. which is derived from the basic electrical Ohm’s law = V = IR.
If there is a potential difference of 1 volt between two ends of the conductor and the flowing current through it is 1Ampere, then the resistance of that conductor would be 1 Ohm (Ω). OR
If 1 ampere of current is flowing through a resistance, and 1 joule per second (1Watt) energy (in the form of heat) is generated, then the measurement of that resistance is 1 Ω.
The reciprocal of the resistance is called conductance.
Symbols of Different Types of Resistors. IEEE & IEC symbols of Resistors
Types of Resistors
- Linear Resistors
- Non Linear Resistors
1. Linear Resistors:
1. 2. Variable Resistors
1. 1. Fixed Resistors
Types of Fixed resistors.
- Carbon Composition Resistors
- Wire Wound Resistors
- Thin Film Resistors
- Thick Film Resistors
1. 1. 1) Carbon Composition Resistors
Generally, they are very cheap and small in size, hence, occupy less space. They are reliable and available in different ohmic and power ratings. Also, fixed resistor can be easily connected to the circuit and withstand for more voltage.
1. 1. 2) Wire wound Resistors
Wire wound resistors make lower noise than carbon composition resistors. Their performance is well in overload conditions. They are reliable and flexible and can be used with DC and Audio frequency range. Disadvantage of wire wound resistor is that they are costly and can’t be used in high frequency equipments.
Wire wound resistors used where high sensitivity, accurate measurement and balanced current control is required, e.g. as a shunt with ampere meter. Moreover, Wire wound resistors are generally used in high power rating devices and equipments, Testing and measuring devices, industries, and control equipments.
1. 1. 3) Thin Film Resistors
1. Carbon Film Resistors
2. Metal Film Resistors
1. 1. 3. 1) Carbon Film Resistors
1. 1. 3. 2) Metal Film Resistors
1.1.4) Thick Film Resistors
1. Metal Oxide Resistors
2. Cermet Film Resistors
3. Fusible Resistors
18.104.22.168) Metal Oxide Resistors
22.214.171.124) Cermet Oxide Resistors
126.96.36.199) Fusible Resistors
1. 2) Variable Resistors
What is the main Difference between Potentiometer and Rheostats?
2. Non Linear Resistors
2. Varisters (VDR)
3. Photo Resistor or Photo Conductive Cell or LDR
2.2) Varisters (VDR)
When voltage increases (due to lighting or line faults) across a connected sensitive device or system, then it reduces the level of voltage to a secure level i.e. it changes the level of voltages.
2.3) Photo Resistor or Photo Conductive Cell or LDR (Light Dependent Resistors)
2.4) SMD (Surface Mount Technology) Resistors
You can read about SMD Resistor with color coding methods.
Application and Uses of Photo Resistors/Photo Conductive Cells or LDR
Uses / Application of Resistors
Resistors are used:
I. For Current control and limiting
II. To change electrical energy in the form of heat energy
III. As a shunt in Ampere meters
IV. As a multiplier in a Voltmeter
V. To control temperature
VI. To control voltage or Drop
VII. For protection purposes, e.g. Fusible Resistors
VIII. In laboratories
IX. In home electrical appliances like heater, iron, immersion rod etc.
X. Widely used in the electronics industries
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