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Electric Components Effect
Sep 04, 2017

Electronic components are the basis of the composition of electronic products, to understand the commonly used electronic components of the type, structure, performance and the right choice is to learn, master the basic electronic technology. Commonly used electronic components are: resistors, capacitors, inductors, potentiometers, transformers, etc., on the installation method, the current can be divided into traditional installation (also known as through-hole DIP) and surface installation of two categories (also known as SMT Or SMD). Transistor, diode called electronic device.

The resistance of the conductor to the current is called the resistance of the conductor. Resistance of small substances known as electrical conductors, referred to as conductors. Resistance of large substances known as electrical insulators, referred to as insulators.

In physics, the resistance (resistance) to represent the role of the current resistance of the conductor size. The greater the resistance of the conductor, the greater the resistance of the conductor to the current. Different conductors, resistors are generally different, the resistance is a nature of the conductor itself.

The resistance of the conductor is usually indicated by the letter R, the unit of resistance is ohm (ohm), referred to as the European, the symbol is Ω (Greek letters, transliteration into phonetic read ōu mì gǎ). Larger units have kernels (kΩ), megger (MΩ) (megabytes, or 1 million).

Resistor referred to as resistance (Resistor, usually referred to as "R") is the most used components in all electronic circuits. The main physical characteristic of the resistance is that the transformer is heat energy, it can be said that it is a energy-consuming component, the current through it to produce internal energy. Resistor in the circuit is usually the role of partial pressure shunt, the signal, the AC and DC signals can be through the resistance.

KΩ (kilohms), MΩ (megohm), their conversion relationship is:

1TΩ = 1000GΩ 1GΩ = 1000MΩ 1MΩ = 1000000Ω 1KΩ = 1000Ω

Resistance of the resistance standard method is usually colored ring method, digital method. Color ring method in the general resistance on the more common. As the resistance in the mobile phone circuit is generally relatively small, rarely marked on the resistance, even if there is also the use of digital methods, namely:

10 ^ 1 - that 10Ω resistance; 10 ^ 2 - that 100Ω resistance; 10 ^ 3 - that 1KΩ resistance; 10 ^ 4 - that 10KΩ resistance; 10 ^ 6 - that 1MΩ resistance; 10 ^ 7 - that 10MΩ resistance.

If a resistor is marked with 22 * 10 ^ 3, the resistance is 22KΩ.

Digital method

The nominal value of the component is represented by a three-digit number. From left to right, the first two digits represent valid digits, and the third bit represents 10n (n = 0 ~ 8). When n = 9 for the special case, that 10 ^ (-1). The plastic resistor 103 represents 10 * 10 ^ 3 = 10k. Chip resistors are digitally marked, such as 512 for 5.1kΩ. Capacitance on the digital label 479 is 47 * 10 ^ (- 1) = 4.7pF. And the flag is 0 or 000 of the resistor, said the jumper, the resistance is 0Ω. Digital method marked, the resistance unit for the ohm, the capacitance unit for the pF, the inductor is generally not digital.

Resistor electrical performance indicators are usually nominal resistance, error and rated power and so on.

It together with other components constitute some functional circuits, such as RC circuits.

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

Common carbon film resistors or metal film resistors can be linearly resisted 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 be overheated and do not follow Ohm's law, and even burned. Many types of resistors, usually divided into carbon film resistors, metal resistors, wirewound resistors, etc.: it also contains fixed resistance and variable resistors, photoresistors, varistors, thermistors and so on.

In general, the use of multimeter can easily determine the resistance is good or bad: the multimeter to adjust the appropriate block in the block, and the multimeter on the two ends of the pen, you can read from the multimeter resistance Resistance. It should be noted that the test resistance when the hand can not touch the metal part of the pen. But in the actual electrical maintenance, there is little resistance to damage. Focus on whether the resistance is Weld, desoldering.


The main function is to hinder the current flow, applied to the current limiting, shunt, buck, partial pressure, load and capacitance with the filter and resistance matching, etc. Digital circuit features pull-up resistor and pull-down resistor.

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