Tiếng ViệtIn electronic circuits there are many different electronic components such as diodes, resistors, capacitors, coils and many different types of electronic components. Usually electronic components have a fixed value and cannot be adjusted, but there is a type of resistor that can be adjusted directly on the device, which is the rheostat. So what is a variable resistor? TTTT will also you learn about what is rheostat ? and the basic information of the rheostat.
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Contents
What is rheostat ? The structure of the rheostat
What is rheostat ?
What is rheostat TTTT ? The rheostat is also a pure resistor, but the special feature here is that the rheostat has the ability to change the value of the resistance value within a certain range on the parameter of the rheostat. The rheostat is installed in electrical circuits that need to adjust the rheostat parameters in the circuit.
Rheostat is a device that can be changed by changing the length of the electrical conductors in the device or by other influences such as temperature, light, electromagnetic radiation to change the existing resistance value. In addition, the rheostat is also known as a potentiometer, which can rotate the rheostat to adjust the parameters of the transformer.
Construction of rheostat
The structure of the rheostat consists of 3 parts including the runner and coil and the output pin of the rheostat:
- A runner is a part that has the ability to follow the coil to change the value of the impedance based on an external influence to rotate / run the runner.
- The coil is a high resistivity alloy and is adjustable from the runner.
- The output pin consists of 3 pins, of which 2 poles are fixed at the top of the resistor and the other pin is the moving pole.
Impedance materials used in rheostats include:
- Carbon, also known as coal resistors, is the most common material for manufacturing rheostats.
- Winding wire is usually made of nichrome with high electrical conductivity.
- Conductive plastics are used in high-voltage audio applications.
- Cermet is a stable material but has a short lifespan and high cost.
Working principle of a rheostat is a component used for what?
Variable resistor is a component used to adjust the parameters of a circuit, mainly the resistance of the circuit. On devices with microchips or knobs. When controlling knobs, closed circuits will change the length of the winding conductors in the circuit to change the circuit parameters.
In fact, the design of electronic circuits always has an error range, so when making adjustments to the circuit, people often use a rheostat to be able to change the resistance of the wrong voltage and current in the circuit.
Classification and effects of rheostats
There are many types of rheostats on the market today, including:
- Coal rheostat: The most common type of rheostat today has a core made of coal.
- Hand crank: A type of resistor with a handwheel used to adjust the resistance through the coil.
- The rheostat is used to adjust the voltage through the runner along the coil.
- Winding Impedance: Designed to operate in circuits with DC and AC currents.
The effect of rheostat in current power system:
- Adjust the resistance in the power system, used to reduce voltage.
- Regulate the current in the electrical system.
- Variable resistor Volume in the sound system.
- Power rheostat is used to adjust system power AVR circuit.
- Thermistor is used to regulate the temperature.
- The light rheostat adjusts the light of the lamp.
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