Academy : +91 8148 211 211 | Service : +91 7338 96 97 98 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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