Electronic Basic

Electronic Basics

Introduction: This article mainly introduces the basic knowledge of electronics, electronic components vary widely, but mainly divided into two categories, one is called passive components, one is called active components, passive components, including capacitors, resistors, inductors, Crystal, etc .; active components include: integrated circuits, transistors, MOS tubes, SCR and so on. Now let Xiaobian introduce it to you one by one ~ ~ ~ ~ ~

1. Electronic Basics - Resistance
   Resistance Definition
   Resistance English name is Resistance, abbreviated as R, which is a conductor of the basic nature of the conductor size, material, temperature. Conductor cross-sectional area, material, length can change the size of the conductor resistance, and sometimes the temperature can also affect the size. The main physical feature of a resistor is that the electrical energy is thermal energy. It can also be said that it is a dissipative component that generates internal energy when it passes through it. Resistor blocking and partial pressure of the role. The resistance R is numerically equal to the ratio of the voltage U applied to the resistor to the current I passed, ie R = U / I.

Resistance classification:
A press production materials can be divided ---- carbon film resistors, metal film resistors, wire wound resistors and cement resistors. Commonly used for carbon film resistors, and cement resistance is often used in high-power electrical appliances or as a load.
B, according to the size of the power can be divided into ---- 1 / 8w the following (chip), 1 / 8W, 1 / 4W, 1 / 2W, 1W, 2W, etc.
C, according to resistance representation can be divided into - digital representation and color ring representation.
Resistance units and conversion:
The units of resistance ---- ohm, kilohm (KΩ), megohms (MΩ), the most basic unit of resistance is ohm (Ω).
Resistance unit conversion ---- 1MΩ = KΩ = Ω
Resistance of resistance identification:
A. Numerical representation ---- This representation is often used in CHIP components. When the first two digits are valid numbers, the third digit is the magnification.
B. Color ring representation ---- first and second ring is a valid number, the third ring is the magnification, the fourth ring is the error.

1. Electronic Basics - Capacitors and Inductors
   Capacitance ---- refers to the charge storage at a given potential difference; denoted as C, the international unit is Faraday (F). Capacitors are also commonly known as capacitors. Capacitance is a physical quantity that characterizes the ability of a capacitor to hold charge. The capacity required to increase the potential difference between the two plates of a capacitor by 1 volt is called the capacitance of the capacitor. Capacitor used to store charge components, stored charge charge and discharge, filtering, coupling, bypass.
   Type ---- Capacitors by polarity can be divided into a polar capacitor and non-polar capacitor, a polar capacitor, including electrolytic capacitors and tantalum electrolytic capacitors; non-polar capacitors, including ceramic capacitors and plastic capacitors.
   Inductance ---- is insulated wire wound from the electromagnetic induction components, is also commonly used in electronic circuits one of the components. Inductance is the use of enameled wire, wrapped yarn or plastic wire in the insulation skeleton or core, core made of a series of coaxial winding around it in the circuit with the letter "L" said the main role is to exchange Signal isolation, filtering or capacitors, resistors and other components of the resonant circuit.

2. Electronic Basics - Two transistors
   Diode ---- also known as the crystal diode, referred to as the diode, it is a one-way conduction current of electronic devices. In the semiconductor diode has a PN junction two lead terminals, this electronic device in accordance with the direction of the applied voltage, with one-way current transmissibility. Commonly used diodes rectifier, voltag

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