Mecoytronix: Resistor

Resistor Basics

Resistor is an electronics component that offers opposition to the flow of electrons. This resistance have a specific electrical resistance. Resistors are primarily used for current limiting, voltage division and similar functions.

The resistance of a resistor is measured in ohms using the Greek symbol omega (Ω).

Picture of a resistor

Types of Resistors

Resistors can be divided in construction type as well as resistance material. The following breakdown for the type can be made:

Fixed resistors
Variable resistors, such as the:

Resistance dependent on a physical quantity:
- Thermistors (NTC and PTC) as a result of temperature change
- Photo resistor (LDR) as a result of a changing light level
- Varistor (VDR) as a result of a changing voltage
- Magneto resistor (MDR) as a result of a changing magnetic field
- Strain Gauges as a result of mechanical load

For each of these types a standard symbol exists. Another breakdown based on the material and manufacturing process can be made:

Resistors can be divided in construction type as well as resistance material. The following breakdown for the type can be made:

Fixed resistors
Variable resistors, such as the:

Resistance dependent on a physical quantity:
- Thermistors (NTC and PTC) as a result of temperature change
- Photo resistor (LDR) as a result of a changing light level
- Varistor (VDR) as a result of a changing voltage
- Magneto resistor (MDR) as a result of a changing magnetic field
- Strain Gauges as a result of mechanical load

For each of these types a standard symbol exists. Another breakdown based on the material and manufacturing process can be made:

Resistors can be divided in construction type as well as resistance material. The following breakdown for the type can be made:

Fixed resistors
Variable resistors, such as the:

Resistance dependent on a physical quantity:
- Thermistors (NTC and PTC) as a result of temperature change
- Photo resistor (LDR) as a result of a changing light level
- Varistor (VDR) as a result of a changing voltage
- Magneto resistor (MDR) as a result of a changing magnetic field
- Strain Gauges as a result of mechanical load

For each of these types a standard symbol exists. Another breakdown based on the material and manufacturing process can be made:

Resistors can be divided in construction type as well as resistance material. The following breakdown for the type can be made:

Fixed resistors
Variable resistors, such as the:

Resistance dependent on a physical quantity:
- Thermistors (NTC and PTC) as a result of temperature change
- Photo resistor (LDR) as a result of a changing light level
- Varistor (VDR) as a result of a changing voltage
- Magneto resistor (MDR) as a result of a changing magnetic field
- Strain Gauges as a result of mechanical load

For each of these types a standard symbol exists. Another breakdown based on the material and manufacturing process can be made:

The basic type of resistors are:
1. Fixed
2. Variable

But different resistors exists based on composition of the resistance material, termination and mounting and the physical quantity in which the resistance is dependent on.

Resistors based on composition of resistance material:
1. Carbon
2. Metal film
3. Wire wound
4. Metal oxide film

Resistors based on termination and mounting:
1. Surface mount
2. Through hole

Resistors based on physical quantity:
1. Light dependent resistor (LDR)
2. Thermistor
3. Varistor
4. Magneto-resistor

Potentiometer

Rheostat

Trimpot

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Wednesday 10 October 2018

Resistor

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