Resistor

  • A resistor is a passive two-terminal electrical component that applies electrical resistance to a circuit.
  • In a simple word, the resistor will limit the flow of current.

Unit & symbol of resistor

  • The unit of resistor is ohm (Ω).
  • It is named after Georg Simon Ohm, a German Physicist.
  • He discovered the law for resistance which is named Ohm’s law.
  • The Ohm’s law deals with relationship between voltage, current and resistance.

Measuring term

  • An ohm is equivalent to volt per ampere (1Ω = 1 V/A)
  • Kilo ohm (1 KΩ = 1000 Ω).
  • Mega ohm (1 MΩ = 1000000 Ω).
  • Giga ohm (1 GΩ = 1000000000 Ω).

Resistance vs current

  • When the value of resistor increases, the flow of current will decrease.

Resistance vs voltage

  • Resistor can also limit the voltage when it acts as voltage divider.

Resistor circuit symbols

  • Old icon
  • Circuit sign

Types of resistors

Based on its working resistors cane be classified into 2 types. 

  • Fixed resistor
  • Variable resistor

Fixed resistor

  • In a fixed resistor the value of resistor cannot be adjusted or changed as per the requirement. If there is a need to adjust the value of resistor, then it needs to be replaced with different value.

Types of fixed resistor

  • Carbon composite resistor
  • Film resistor
  • Wire wound resistor

Carbon composite resistor

  • For high-frequency applications
  • Very economical to make
  • Have very large Tolerance

Film resistor

  • The resistive value of the resistor is regulated by increasing the desired thickness of the deposited film.
  • Resistance as much as 10MΩ can be obtained.
  • Have tolerance 1% or less

wire wound resistor

  • Made by winding a thin steel alloy wire to an insulating ceramic in the form of a spiral helix.
  • Available in very low ohmic and also high precision values (from 0.01 to 100kΩ).

Types of variable resistor

  • Rheostat
  • Potentiometer
  • Thermistor
  • Humistor
  • Varistor
  • Photoresistor

Rheostat

  • Rheostat is a flexible resistor used in applications that require change of current or varying of resistance in an electric circuit.
  • A special form of rheostat is the potentiometer.

Potentiometer

  • A potentiometer or a pot, is an electronic device that is a three-terminal resistor with a sliding get in touch with that develops an adjustable voltage divider panel.
  • Potentiometers are generally used to control electrical instruments such as volume controls, joysticks etc.,

Thermistor

  • A thermistor is a kind of resistor whose resistance varies significantly with temperature.

Humistor

  • A humistor is a type of resistor whose resistance differs significantly with humidity.
  • A humidity sensing unit steps the humidity level by gauging the adjustment in the resistance of an element.

Varistor

  • A varistor (or voltage-dependent resistor) feature is to conduct significantly increased current when voltage is excessive.

Photoresistor

  • A photoresistor or Light-Dependent Resistor (LDR) exhibits photoconductivity.
  • Photoresistors are used in lots consumer things such as street lights, clock radios etc.

Resistor

  • A resistor is a passive two-terminal electrical component that applies electrical resistance to a circuit.
  • In a simple word, the resistor will limit the flow of current.

Unit & symbol of resistor

  • The unit of resistor is ohm (Ω).
  • It is named after Georg Simon Ohm, a German Physicist.
  • He discovered the law for resistance which is named Ohm’s law.
  • The Ohm’s law deals with relationship between voltage, current and resistance.

Measuring term

  • An ohm is equivalent to volt per ampere (1Ω = 1 V/A)
  • Kilo ohm (1 KΩ = 1000 Ω).
  • Mega ohm (1 MΩ = 1000000 Ω).
  • Giga ohm (1 GΩ = 1000000000 Ω).

Resistance vs current

  • When the value of resistor increases, the flow of current will decrease.

Resistance vs voltage

  • Resistor can also limit the voltage when it acts as voltage divider.

Resistor circuit symbols

  • Old icon
  • Circuit sign

Types of resistors

Based on its working resistors cane be classified into 2 types. 

  • Fixed resistor
  • Variable resistor

Fixed resistor

  • In a fixed resistor the value of resistor cannot be adjusted or changed as per the requirement. If there is a need to adjust the value of resistor, then it needs to be replaced with different value.

Types of fixed resistor

  • Carbon composite resistor
  • Film resistor
  • Wire wound resistor

Carbon composite resistor

  • For high-frequency applications
  • Very economical to make
  • Have very large Tolerance

Film resistor

  • The resistive value of the resistor is regulated by increasing the desired thickness of the deposited film.
  • Resistance as much as 10MΩ can be obtained.
  • Have tolerance 1% or less

wire wound resistor

  • Made by winding a thin steel alloy wire to an insulating ceramic in the form of a spiral helix.
  • Available in very low ohmic and also high precision values (from 0.01 to 100kΩ).

Types of variable resistor

  • Rheostat
  • Potentiometer
  • Thermistor
  • Humistor
  • Varistor
  • Photoresistor

Rheostat

  • Rheostat is a flexible resistor used in applications that require change of current or varying of resistance in an electric circuit.
  • A special form of rheostat is the potentiometer.

Potentiometer

  • A potentiometer or a pot, is an electronic device that is a three-terminal resistor with a sliding get in touch with that develops an adjustable voltage divider panel.
  • Potentiometers are generally used to control electrical instruments such as volume controls, joysticks etc.,

Thermistor

  • A thermistor is a kind of resistor whose resistance varies significantly with temperature.

Humistor

  • A humistor is a type of resistor whose resistance differs significantly with humidity.
  • A humidity sensing unit steps the humidity level by gauging the adjustment in the resistance of an element.

Varistor

  • A varistor (or voltage-dependent resistor) feature is to conduct significantly increased current when voltage is excessive.

Photoresistor

  • A photoresistor or Light-Dependent Resistor (LDR) exhibits photoconductivity.
  • Photoresistors are used in lots consumer things such as street lights, clock radios etc.
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