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Electric Components Notice The Limit Parameters Of The Resistor
Nov 02, 2017

Electronic components are the basis of electronic products, understanding the types, structure, performance and selection of common electronic components is the basic of learning and mastering electronic technology. Commonly used electronic components are: resistor, capacitor, inductor, potentiometer, transformers, etc., in terms of installation, the current can be divided into traditional installation (also known as hole DIP) and surface mounted two categories (i.e., also known as SMT/SMD). The transistor and diode are called electronic devices.

The resistance of the conductor to the current is called the resistance of the conductor. A substance that is small in resistance is called an electric conductor, or a conductor. The substance of the resistance is called an electrical insulator, or an insulator.

In physics, resistance is used to represent the magnitude of the conductor's resistance to current. The greater the resistance of the conductor, the greater the resistance of the conductor to the current. Different conductors, different resistors, resistance is a property of the conductor itself.

The resistance of the conductor is usually expressed in the letter R, the unit of resistance is the ohm (ohm), referred to as "o, symbol is Ω (Greek letter, transliterated into pinyin read not u mi g m:). Larger units have thousand Europe Ω (k), megohm Ω (M) (trillion = millions, 1 million).

Resistor or resistance (Resistor, usually expressed in the "R") is the most used electronic circuits of all components. The main physical feature of the resistance is that it can be used to heat energy, or it can be said that it is a energy-consuming element, and the current is produced by it. Resistance is usually a partial pressure shunt in the circuit. For signals, both ac and dc signals can be passed by resistance.

Ω Ω K (M), M (mge) and their conversion relations are:

1 t Ω Ω = 1000 g 1 g Ω = 1000 m Ω 1 m Ω Ω = 1000 = 1000000 Ω 1 k Ω

Resistance of resistance marking method is usually colored ring method, digital method. The color ring method is more common in general resistance. Because the resistance in the cell phone circuit is generally small, it is rarely marked with resistance. Even if it is, the digital method is usually adopted, namely:

10 ^ 1 -- said 10 Ω resistance; 10 ^ 2 - said 100 Ω resistance; Said 10 ^ 3-1 k Ω resistance; 10 ^ 4 -- 10 k said Ω resistance; 10 ^ 6 - said 1 m Ω resistance; 10 ^ 7-10 m Ω resistance.

If a resistor superscript is 22 * 10 ^ 3, the resistance to 22 k Ω.

The digital method

Represents the nominal value of a component with three digits. From left to right, the first two represent effective digits, and the third digit is 10n(n=0 ~ 8). For the special case when n = 9, said 10 ^ (1). Plastic resistor of 103 said 10 * 10 ^ 3 = 10 k. Sheet resistance multi-purpose digital method, such as 512 Ω said 5.1 k. Capacitors on the digital sign of 47 479 * 10 ^ (1) = 4.7 pF. And logo is 0 or 000 resistor, says is a jump line, resistance to 0 Ω. When the digital method is marked, the resistance unit is ohm, the capacitor unit is pF, and the inductance is not digitally marked.

The electrical performance indicators of resistor are usually marked with nominal resistance, error and rated power.

It forms functional circuits, such as RC circuits, with other components.

Resistance is a linear element. It is a linear element, because it is found that under certain conditions, the current flowing through a resistor is proportional to the voltage of the resistor - that is, it conforms to ohm's law: I=U/R

The common carbon film resistor or metal film resistor is simulated by linear resistors when the temperature is constant and the voltage and current values are limited to the rated conditions. If the voltage or current value exceeds the specified value, the resistor will overheat and not comply with ohm's law, or even burn. There are many kinds of resistance, usually divided into carbon film resistance, metal resistance, wire wound resistance and so on: it also contains fixed resistance and variable resistance, photosensitive resistance, pressure sensitive resistance, thermal resistance, etc.

In general, use multimeter can easily determine the stand or fall of resistance: the multimeter to adjust in proper range of the electric block, and put the two pens and a multimeter at both ends of the resistance, can be read out from the multimeter resistance value. It should be noted that the hand cannot touch the metal part of the pencil when the resistance is tested. However, in the actual electrical maintenance, there is very little resistance damage. The emphasis is on whether the resistance is not soldered or not soldered.

Function:

Main function is to block current flow, applied to the current limit, shunt, step-down, partial pressure, load and filter capacitor with cooperation and impedance matching, etc. In the digital circuit features pull-up resistors and pulldown resistor.

Note the limit parameters of the resistor:

Rated voltage: when the actual voltage exceeds the rated voltage, the resistor will be punctured even if the power is met.

Rated power: the rated power of the selected resistor shall be more than double the actual load, which will ensure the reliability of the resistor in the medium and long term.





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