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Thursday, March 4, 2021

How to measure resistance | What is resistance? | what is resistors

What is resistance and how it is work?

what is resistance

What is resistance? | what is resistors

What is resistance ?

And what are the types of resistance , how is the resistance measured, and what is its use?

Definition - "Resistance in Current Flow in a Circuit is called Resistance or Resistance" Resistance which is displayed by Ohm Ω and its Symbol is in the picture below. it is called Resistance

What is resistance how it is work

👉🏻 Resistance is used to control or reduce current.

What is resistance how it is work

The difference between the two words Resistance or Resistor is that Resistance is a sign and Resistor is a device generating resistance.both of them mean resistance.

Type of resistance

There are two types of resistors.
  1. Fixed Resistor with Resistance Fix.
  2. Variable Resistor whose resistance can be less.

    Fixed Resistor ie Simple Resistance which is given in the picture. You must have seen this in any circuit, it has a fix value, where the fix resistance is required, it is used.

    Fixed resistors are a type of linear resistor.  Fixed resistors are called resistors that have a fixed value. The value of a fixed resistor can’t be changed like a variable resistor.  This is because the value of the fixed resistors is determined when making it.

Types of fixed resistors.

Carbon composition resistor

 This resistor is common.This type of resistor is very easy to make and their market prices is also very low.Carbon composition resistors are mainly made of carbon clay which is covered with a plastic cover.
The lead of this resistor is made of tinned copper.

The main advantage of using this type of resistor is that they are very easy to find and very cheap and they are also very durable.

The disadvantage of using carbon composition resistors is that they are quite sensitive to temperature.
In this type of resistor, the electric current moves from one carbon particle to another carbon particle, due to which it also produces some electrical noise.
  • Use of carbon composition resistor
  • Carbon composition resistor is used in high frequency applications.
  •  It is used in high voltage power supply.
     It is used in current limiting circuit.

    Wire wound resistor

    The wire wound resistor consists of a wire of manganine or constants wrapped around a cylinder of insulating material.
    The temperature coefficient of manganine and concatenation is 0 due to which the resistance changes with the temperature in these resistors is non-existent.
    The cost of these resistors is much higher than the carbon resistors.
    Wire wound resistors are used when the carbon composition resistor is unable to function due to its limitations.

    Use of wire wound resistor
     1.Wire wound resistor is used in space and defense functions.
     2.It is used to balance voltage and current.
     3.This resistor is also used in computers.

     Thick and thin film resistor

     A resistive layer is mounted on the ceramic base of the film resistor, the thickness of which determines whether the resistor is a thick film resistor or a thin film resistor.

    The thickness of the resistive layer of the thick film resistor is much greater than the thickness of the resistive layer of the thin film resistor.

    Thick film resistor is produced by a special paste that mixes glass and metal oxide into the substrate.

    There are three types of thick film resistor, fusible resistor, ceramit film resistor and metal oxide film resistor.

    Variable Resistor

    This type of resistor can adjust the resistance, that is, we can reduce its knob and we have to rotate its knob, we must have used it in Old Television to reduce the volume Resistance of this type of resistor to the maximum-min limit  Comes.

    A variable resistor is a device whose resistance can be lowered according to its needs in electronic circuits.
    It can be used as 2 terminals as well as 3 terminals.It is mainly used as a 3 terminal.  Variable resistors are used for calibration of equipment.

    Variable Resistor Types


     Whenever we measure the current and potential difference with an ammeter or voltmeter, we do not have a pure value because when we add an emitter or voltmeter to the circuit, it disturbs the original circuit but the potentiometer There is a tool with which we can assess the current and potential difference very accurately.A potentiometer is a resistor that is used to control the voltage in a circuit.

    A potentiometer is made up of 3 terminals in which two terminals are fixed, then one terminal is variable.

    The 2 fixed terminals of the potentiometer are connected to both ends of the register material called the track and the third terminal is connected to a slider called the wiper.

    As soon as the wiper moves on the path of resistance, at the same time the resistance of the potentiometer starts changing.

    Potentiometer Use

     1. Potentiometers are used as voltage dividers in electronic circuits.
     2. Potentiometers are used to reduce the noise in radio and television.
     3. It is also used in medical devices.

    Resistance colour code

    How to measure resistance?

    You can use Ohm's law to measure the Resistance of any Resistor or the Color Code is the best option or you can measure the resistance of any resistor by using Multi-meter.

    Check Resistor using multimeter.

    We can also find out the resistor of a resistance  using the multimeter.You have to connect both the terminals of resistance to the terminal of the multimeter and on the display of the multimeter you will see the resistance.

    Check Resistor using multimeter

    I hope you have got important information related to resistance. 
    Like this measurement, like what is Resistance and how is Resistor how to measure this information, if you have any doubt then share it with your friends in your school, collage and facebook to share button is below and if you any question write in a comment. 
    Thank you

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