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Varistor.What Is Varistor Introduction to Resistor Symbols

Varistor.What Is Varistor Introduction to Resistor Symbols

August 29 , 2023 0

Varistors are devices that can adjust the amount of resistance and are connected to a circuit to adjust the amount of current. A typical varistor consists of a wire with a large resistance (resistance wire) and a device that can change the contact point to adjust the effective length of the resistance wire..Joinwin Electronics, is a professional electronic components distributor, we have the world's major brands of resources, varistor

Principle of Varistors

A varistor is a resistive device that can change the value of resistance. It consists of a variable resistive element and some connecting leads.
The principle of a varistor is to control the amount of current or voltage by changing the resistance value of the variable resistive element. The variable resistive element may be a slide varistor, a knob varistor or an electronic component such as a constant current diode.
When the resistance value of the variable resistive element is changed, the voltage or current across the resistor is changed accordingly. For example, if the resistance value of the variable resistive element increases, the current through the resistor decreases.
Variable resistors can be used in a variety of circuits, such as electronic devices, wireless communications, and school experiments. Its main function is to control the current or voltage in a circuit so as to regulate and control the circuit.

A varistor consists of a rotatable sliding contact with a fixed resistance. When the sliding contact is in a different position, the resistance in the circuit changes, thus affecting the flow of current.

Varistors can be categorized into two types: linear varistors and non-linear varistors. In a linear varistor, the resistance increases or decreases in equal proportion to the change in position of the sliding contacts. Non-linear varistors have a different resistance-position relationship curve.

Role of Varistors

The main function of the varistor is to adjust the resistance value in the circuit so that the current can be changed rapidly. This is useful for applications that require adjustment of output voltage or current, such as dimming lights, adjusting fan speed, and regulating temperature.

In addition, varistors can also be used to match the impedance in a circuit, for signal transmission and filtering, automatic control and protection of circuits, and other application scenarios.

Types of Varistors

According to different working principles and structural forms, varistors can be categorized into the following types:

1. Potentiometer: A potentiometer is a rotary varistor that can adjust the value of resistance, and its main structure consists of a knob, a fixed end and a sliding end. The main structure consists of a knob, a fixed end and a sliding end. By rotating the knob, the resistance between the sliding end and the fixed end can be changed, thus realizing the regulation and control of the circuit.

2. Variable Resistor: A variable resistor is a linear varistor that can be adjusted in resistance value, and its main structure includes an adjustable resistor and a fixed resistor. The main structure includes adjustable resistors and fixed resistors. Adjustable resistors can be adjusted by external power supply, while fixed resistors are not adjustable.

3. Photoresistor: Photoresistor is a kind of light-sensitive element that can adjust the resistance value, and its resistance value changes with the change of light intensity. Photoresistors are mainly used in light-controlled circuits, which can be used to control the working state of the circuit through the change of light intensity.

4. Thermistor: Thermistor is a kind of thermal element which can adjust the resistance value, and its resistance value changes with the change of temperature. Thermistors are mainly used in temperature control circuits, which can control the working state of the circuit by the change of temperature.

Applications of Varistors

Varistors are used in a wide range of applications, including the following:

1. Adjustment and control in electronic devices: Varistors can be used for adjustment and control in electronic devices, such as volume controllers, light regulators, video game controllers and so on.

2. Signal adjustment in circuits: Varistors can be used for signal adjustment in circuits, such as gain adjustment in circuits, frequency adjustment in filters and so on.

3. Signal processing in sensors: varistors can be used for signal processing in sensors, such as photoresistors can be used in light control sensors, thermistors can be used in temperature sensors, etc.

4. Load matching in circuits: Varistors can be used for load matching in circuits, such as matching the output signal of the circuit with the load to achieve the best circuit performance.