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 their working resistors can 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 simple words, the resistor will limit the flow of current.
Unit & symbol of resistor
- The unit of the resistor is the ohm (Ω).
- It is named after Georg Simon Ohm, a German Physicist.
- He discovered the law for resistance which is named Ohm’s law.
- Ohm’s law deals with the relationship between voltage, current, and resistance.
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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 the resistor increases, the flow of current will decrease.
Resistance vs voltage
- The resistor can also limit the voltage when it acts as a voltage divider.
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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.