What is a Resistor and how does a Resistor work?

The resistor is an electrical component which produces resistance in the circuit. Resistance is displayed by ohm (Ω)...

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What is the resistor?

A resistor is an electrical component such as diodes, capacitors, etc. In the electronic circuit, the resistive is used to stop or reduce the flow of the current. There are many types of registers, depending on their work; they are kept in different categories. Mainly it consists of 2 types: - Fixed Resistor, Variable Resistor.

All registers have their own Resistance, which works as Circuit Element in any circuit. The resistance of the fixed resistor is constant because only due to temperature can be little or more. We can use Variable Resistors on the basis of our need. It is used inside Volume Control and Lamp Dimmer. So they can be controlled.

Types of Resistor

As we have told earlier that the registers are mainly of two types, they are further divided into different categories based on their texture and on the basis of their usage, which is given below.

1. Fixed Resistors

Fixed registers are those whose registers do not change much because of the temperature, their resistances remain the same. And the Fix Register is also further divided into some categories or on the basis of which the list is given below.

Carbon Composition Resistors: -
Carbon Composition Fixed Resistor is commonly made by granular or powder carbon and graphite, and this mixture is made in the form of a rod and two caps of metals are placed on either side. To connect the register with the circuit, a conductor wire is also placed on both ends so that it can be easily applied to any circuit. And the color code is also done on the basis of the Registry value of the register above these registers. With the help of this color code, you can find the value of any register.

These registers are very small and cheap, this takes very little space in any circuit, and this resistance is found in different range but these registers are very less stable. That means the temperature has a lot of influence on them.

Wire Wound Resistors: -
In these resistors, a resistive wire is wrapped around the insulating core or rod, and this wire is mostly made of Tungsten, Manganin, Nichrome or Nickel and Nickel-Chromium Alloy. These resistors Insulating Core Or Rod are made of ceramic clay material. These resistors are quite expensive and are used only in a particular circuit such as a Wheatstone bridge.

This resistance ranges from 2 Watt to 100 Watt or more, and Ohmic value of this resistance can also be from 1 Ohm to 200k Ohms or more. This resistance works up to 350° C temperature evenly. They do very little noise compared to the resistive Carbon Composition Resistors, and it can also be used for DC and audio frequency. But they also have some disadvantages as they are quite expensive and can not be used in high-frequency devices.

Thin Film Resistors: -
All Thin Film resistors are made of ceramic and resistance materials and this resistive is also further divided into two categories. In this resistance, good quality ceramic and handmade insulating rod, a layer of conductive material is placed around the plate or tube.

Carbon Film Resistors: -

In Carbon Film Resistors, Insulating Material Rod made of high-grade ceramic material and the very thin layer of Resistive Carbon on top of this rod is placed around it.

Metal Film Resistors: - Metal film resistors are made similar to Carbon Film Resistors, but the difference is simply that. In this resistant metal is replaced by carbon and it can be Nickel Chromium metal. These resistors are very cheap and good to work, and even when this temperature is high or low, they do their work perfectly and their noise is also very low.

Thick Film Resistors: - This resistor is also made like the Thin Film Resistors, but the only difference between these two is that Thin Film Resistors are very thin carbon layer and the thickness of the carbon layer in Thick Film Resistors is a bit thicker. Therefore, this resistor is called Thick Film Resistors. And it is further divided into three categories.

Metal Oxide Resistors: - To make Metal Oxide Resistor, the layer of tin chloride is applied by the oxidizing method to the top of the glass rod, which creates a metal oxide resistor. These resistors can be made up to a much larger range and also at higher temperatures. Work very well and they are used in high voltage circuits.

Cermet Oxide Resistors: -

Cermet Oxide Resistors have ceramic insulation material. This is covered by a layer of carbon or alloy and which is deposited by Ceramic metal. Ceramic metal is called Cermet only. These resistive are square and rectangular. And to apply them on the circuit, the pin is also given below, so that it can be easily applied on any printed circuit board, and this resistor works very well even at very high temperatures.

Fusible Resistors: - These are resistor to the same as the Wire Wound Resistor. When the power rating of a circuit increases more than a specified value. Then it works like resistive Fused. As it breaks or opens the circuit. That is why this resistor is called Fusible Resistors. Fusible Resistors do two things at a time. It also reduces the flow of current and at the same time works like a fuse.

2. Variable Resistors

Variable Resistors are those which can be changed to the resistance value, such resistors are used to control the volume in radio-TVs. These resistors are three types.

Potentiometers: -
Potentiometer is a resistor that acts as a control in the voltage level in any circuit. The total resistance of this resistor is the resistance between the two terminals. Now the middle terminal is used to control its registers, which is less or more of its resistances when rotating right or left.

Nowadays there are many such resistors in the market which are used in different devices. This kind of resistance can still be seen in radio or old TV.

Rheostats: -
Rheostats is such a resistance in this we will see two or three terminals, and it is used to control current. It has to be set by hand to control the current. This resistor is also known as Tapped Resistors and Variable Wire Wound Resistors.

Rheostats or Variable Wire Wound Resistors found in range ranging from 1 Ohm to 150 Ohms, and the power rating of these resistance ranges from 3 to 200 watts, but most resistant to the power rating of only 5 to 50 watts is used.

Trimmers: - For the good operation of the resistive and the efficiency, an additional screw is inserted into it, which is known as Trimmers Resistant. But to change the resistance of this resistor, you need a screwdriver. Rotating the screw of this resistor with the help of a screwdriver changes its registry.

This resistor is made by Carbon Composition, Carbon Film, Cermets, and Wire Materials. In the market, you will find this resistor range from 50 Ohms to 5 Mega Ohms.


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What is a Resistor and how does a Resistor work? What is a Resistor and how does a Resistor work? Reviewed by Technical Kanu on Sunday, March 03, 2019 Rating: 5

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