Parameters include nominal resistance, rated power and allowable deviation.
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Nominal resistance value: The nominal resistance value usually refers to the resistance value marked on the resistor, which is one of the basic parameters of the resistor. Nominal resistance values are generally expressed in numbers, in ohms (Ω), and can also be expressed in thousands of ohms (kΩ) or megohm (MΩ).
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Rated power: Rated power refers to the maximum power allowed by the resistor to work continuously for a long time under a certain pressure and temperature, and is one of the important parameters of the resistor. Rated power is generally expressed by the letter P, the unit is watt (W), and some resistors are directly marked with digital rated power, such as 1\/8W, 1\/4W and so on.
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Allowable deviation: The allowable deviation refers to the maximum deviation range between the actual resistance value and the nominal resistance value of the resistor, which is an important parameter of the resistor. The allowable deviation is generally expressed by the letter M, the unit is percentage, and the common allowable deviation is ±5%, ±10%, and ±20%.
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In addition, there are some other parameters that can be used to express the performance of the resistor, such as accuracy, temperature coefficient, voltage coefficient, etc. When selecting the resistor, it is necessary to select the appropriate parameter specifications according to the requirements of the circuit and the actual situation.
The size specifications of the Resistance mainly have the following parameters:
1 Rated resistance value (Resistance value) : The resistance value of the resistance is its most basic parameter, usually expressed in ohms (Ω).
2. Resistance tolerance: The resistance tolerance of a resistor indicates the deviation range between it and the nominal resistance value, usually expressed as a percentage.
3. Power dissipation: The maximum power that a resistor can withstand, usually in watts (W).
4. Rated voltage: The maximum voltage that the resistor can withstand.
5. Temperature coefficient: Proportional relationship between resistance and temperature, usually expressed in parts per million ° C (ppm\/ ° C).
6. Package type: the outline size and shell type of the resistor, the common package has patch resistance, plug-in resistance, axial resistance and so on.
These specifications will vary according to different resistance types and applications.
Resistors are common passive components in electronic components that are used to limit the flow of current. Its size can be measured by the resistance value, in ohms (Ω).
The specifications of the resistance include resistance value, power tolerance, precision and temperature coefficient. The resistance value indicates the degree to which the resistance obstructs the current, and usually has two kinds of fixed value and adjustable value. Power tolerance indicates the maximum power that a resistor can withstand, usually in watts (W). Precision represents the difference between the actual value of the resistance and the nominal value, usually expressed as a percentage (%). The temperature coefficient indicates the degree to which the resistance value changes with temperature, usually expressed as a percentage change per degree Celsius (%\/ ° C).
Resistance also has some other important parameters, such as maximum operating voltage, minimum operating temperature, size and so on. These parameters can be selected according to the specific needs of the appropriate resistance model. Common resistance specifications are patch resistors, potentiometers, adjustable resistors, etc.
If resistance is, common have a nominal value of 1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.7, 3.0, 3.3, 3.6, 3.9, 4.3, 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1 times 10 to the NTH power, fan Circumference 0.0 to 10 megabytes are common, but now demanding occasions, all use five-color ring precision resistance, the effective value is three. Some non-standard resistance values are customized. There is also a parameter is the power, depending on the actual situation to choose the appropriate power