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What Is A Fixed Resistance? Symbol For A Fixed Resistance

What Is A Fixed Resistance? Symbol For A Fixed Resistance

October 25 , 2023 0

Fixed resistance is a common type of resistor. The characteristic of this resistance is that its resistance value generally does not cause measurable changes due to natural or human factors. It has a fixed resistance value, and the size of the current is basically not affected by temperature, voltage and frequency and other factors, fixed resistance is widely used in electronic circuits. A voltage or current used to stabilize a circuit in an electronic device

Symbol For A Fixed Resistance

Principle And Classification OF Fixed Resistance

Principle: Fixed resistance is to use the resistance characteristics of the material, by selecting the appropriate material and size parameters to achieve a fixed positive value. Usually, the fixed positive is made of conductive materials, such as carbon film, metal film, metal oxide film, etc.
Classification: According to different manufacturing processes and materials, fixed resistance can be divided into the following categories
(1) Carbon film resistor: Carbon film resistor is made of conductive carbon material uniformly coated on the insulator substrate. It has the characteristics of low price, stable temperature coefficient and so on.
(2) Metal film resistance: Metal film resistance is formed by uniformly plating metal materials (such as nickel alloy) on the insulator substrate. It has higher accuracy and stability.
(3) Metal oxide film resistance: metal oxide film resistance is the metal oxide material (such as tin oxide, oxide) are plated on the ceramic substrate made of. It has the characteristics of high power and high temperature resistance.

Characteristic OF Fixed Resistance

Resistance value range: The resistance value of the fixed resistance can be selected according to the need, usually ranging from a few ohms to several megohm.
Accuracy: The accuracy of a fixed resistance refers to the allowable error range, usually expressed as a percentage or absolute value. The common accuracy grades are 1%, 5%, 10%, and so on. The higher the accuracy, the smaller the error between the resistance value and the nominal value.
Temperature coefficient: The resistance value of a fixed resistance changes with the temperature, and this rate of change is called the temperature coefficient. The temperature coefficient indicates the stability of the temperature characteristics of a given resistance, and common temperature coefficients are PPM/C(parts per million/Celsius) and %RH(percentage relative humidity).
Power capacity: The power that a fixed resistance can withstand is called the power capacity. The power capacity determines whether the resistance can work properly without overheating and damage. It is usually expressed in watts (W).
Frequency characteristics: The resistance value of a fixed resistor may vary in a high-frequency circuit, due to the inductance and capacitance effects of the resistor itself. Therefore, it is necessary to pay attention to the frequency characteristics of resistance in high frequency circuits.

Application OF Fixed Resistance

Circuit current limiting: A fixed resistance can be used to limit the size of the current and protect the circuit and components from excessive current damage. For example, in an LED circuit, a fixed resistance can be used to limit the current, ensuring that the LED operates within the appropriate current range.
Partial voltage and bias: A fixed value resistor can be used for partial voltage and bias of the circuit to adjust the size of the voltage signal and the bias point. For example, in an amplifier circuit, a fixed-value resistor can be used to achieve the partial voltage of the signal and the bias setting of the circuit.
Calibration and measurement: Fixed resistance can be used to calibrate instruments, measurement circuits and sensors. By selecting a suitable fixed resistance, a stable and accurate resistance value can be provided for calibrating and measuring the accuracy of the circuit
Signal matching: Fixed resistors can be used for signal matching and impedance matching. In the circuit, in order to ensure that the signal transmission can match different components and systems, it is necessary to use fixed resistance for signal matching.
In summary, a fixed resistance is an electronic component with a fixed resistance value, which is widely used in electronic circuits in current limiting, partial voltage, bias, calibration. Measurement and signal matching. The fixed resistance has different classification, characteristics and application scenarios, and the suitable fixed resistance can meet the requirements of circuit design and application.