What does dc, ac mean, which two words thank you

DC is the abbreviation of direct current, which means direct current in Chinese;

ac stands for alternate current or alternating current, which means communication in Chinese.

Abbreviation of electrical noun, DC dcor DC, AC acor ac

AC isAlternating current(alternating current), DC isDirect current（direct current）。

Alternating current refers to the current whose direction changes periodically over time, with an average current of zero in a cycle. Unlike direct current, which changes its direction over time, direct current does not change periodically.

Direct current is the one-way flow or movement of electric charges, usually electrons. Current density.

It changes over time, but usually the direction of movement is the same at all times.

Principle. The circuit through which direct current passes is called a DC circuit, which is a closed conductive circuit composed of a DC power supply and a resistor. In this DC circuit, a constant electric field is formed.

Outside the power supply, a positive charge.

It flows from a high potential to a low potential through a resistor, and in the power supply, it relies on the non-electrostatic force of the power supply.

The effect is to overcome the electrostatic force, and then from the low potential to the high potential, and so on, forming a closed current line.

So, in a DC circuit, the role of the power supply is to provide a constant electromotive force that does not change with time.

Replenishes the Joule heat expended on the resistor.

AC isAlternating currentSource means, DC isDirect currentThe meaning of the source.

AC current is the average operating value of alternating current in a period of time.

Zero. DC direct current is a kind of direct current, which is a direct current that does not change in size and direction. When transmitting the same power, the wire used for DC transmission is only 2 3 1 2 of AC transmission.

Introduction: Household AC power plug and socket refer to the device used to connect the alternating current provided by the mains power to make household appliances and portable small equipment energized and usable. The power plug has a male connector protruding in the shape of a rod or copper plate, which is physically plugged into a socket or notched female power outlet.

The plug generally has a live wire (with a short hole), a neutral wire connector (with a long hole), and some have a grounding connector (**round hole). There are a variety of plugs that do not specifically distinguish between live and neutral wires, and some connectors will have multiple live wires. These connectors may be plated with copper, tin, or nickel power sockets, which are slotted or recessed female connectors that allow a power plug with a rod or copper plate to protrude into the appliance to conduct power through the plug.

Generally, sockets are designed to be plugged in other than the same specification, and some sockets will have rod-shaped protrusions with holes in the plug.

dc：Refers to DC-DC, DC-DC is a device that changes the electrical energy of one voltage value into the electrical energy of another voltage value in the DC circuit, which uses microelectronic technology to combine small surface-mounted integrated circuits and cracked micro electrical dry components.

Assembled into a single unit.

ac：ac, ac, ac, or an abbreviation that may refer to something. For example, the abbreviation of "academic", the axiom of choice.

axiom of choice) and so on, which mean different things in different contexts.

Applications:

DC-DC power modules.

It is widely used in power electronics, military industry, scientific research, industrial control equipment, communication equipment, instrumentation, switching equipment, access equipment, mobile communications, routers and other communication fields and industrial control and automotive electronics.

aerospace and other fields. Due to the short design cycle, high reliability, and easy system upgrade of the power supply system using modules, the application of power modules is becoming more and more extensive.

Especially in recent years, due to the rapid development of data services and the continuous promotion of distributed power supply systems, the growth rate of power modules has exceeded that of primary power supply. With the extensive use of semiconductor processes, packaging technologies, and high-frequency soft switches, power modules are becoming more and more densely densified, and the conversion efficiency is getting higher and higher, and the application is getting simpler and simpler.

AC is the English abbreviation for AC Power Supply, and DC is the English abbreviation for DC Power Supply.

An AC DC power supply is a power converter with AC input and DC output. For example, the power adapters of mobile phone chargers, laptops, and tablets that we commonly use are all this kind of power supply.

The power converter contains a step-down circuit, a rectifier filter circuit, and a voltage regulator circuit. In AC DC power conversion applications, a wide input range is required, usually 85V 265V AC input, the output power conversion efficiency is required to be high, and at the same time, it can effectively improve energy efficiency, and full load efficiency is a major consideration in AC DC power supply design.

The way to improve the efficiency of AC DC converters and achieve better energy-saving performance is the advocacy of green energy.

AC, DC means alternating current, direct current.

AC DC (ac DC) means that the specification of the power supply is AC input and DC output, which belongs to one of the classification of switching power supply. ac=alternating current.

AC DC is the conversion of AC to DC, and its power flow direction can be bidirectional, the power flow from the power supply to the load is called "rectification", and the power flow from the load back to the power supply is called "active inverter".

The input of AC DC converter is 50 60Hz alternating current, because it must be rectified and filtered, so a relatively large filter capacitor is indispensable, and at the same time, due to the limitations of safety standards (such as UL, CCEE, etc.) and EMC directives (such as Qingxing IEC, FCC, CSA).

In addition, due to the internal high-frequency, high-voltage, and high-current switching actions, it is more difficult to solve the EMC electromagnetic compatibility problem, and it also puts forward high requirements for the internal high-density installation circuit design.

Due to the same reason, the high-voltage and high-current switching increases the power supply working consumption, which limits the process of AC DC converter modularization, so the power system optimization design method must be adopted to achieve a certain degree of satisfaction.

AC and DC mean the English abbreviations of alternating current and direct current, respectively.

The differences between direct current and alternating current are as follows:

1. Take the flow of a river as an analogy with an electric current. Direct current is a method in which an electric current always flows in a specific direction. It refers to the flow of current obtained from batteries, accumulators, solar cells, etc.

Alternating current, on the other hand, is a method of switching the positive and negative electrodes periodically, and the direction of current flow changes accordingly. This is the current obtained from a generator or outlet. The electricity generated by power plants and delivered to homes is also transmitted in the form of alternating current.

2. In direct current, the voltage is always constant, and the current flows in a certain direction. Conversely, in alternating current, the voltage periodically changes from positive to negative and from negative to positive, and the direction of the current changes periodically accordingly.

Characteristics of direct current

Direct current, which always flows in a constant direction, has the following advantages and disadvantages.

1) The advantage is that there is no advance or delay in the circuit; No reactive power is generated; It is possible to store electricity.

2) The disadvantage is that it is difficult to interrupt the current; Difficulty in voltage conversion; Strong electrolysis. Filial piety is closed.

In alternating current, the direction of the current is constantly changing. So, for example, when a circuit contains capacitors or inductors, there is a delay or advance in the behavior of the current flowing to the load relative to the voltage. However, in the case of direct current, the voltage and current directions are always the same, and therefore the behavior of the capacitors and coils is always the same.

So, in DC, there is no advance or delay in the circuit.

Characteristics of alternating current

Alternating current has periodic positive and negative voltages and has the following advantages and disadvantages.

1) The advantage is that the power loss is smaller due to high-voltage transmission; Easy to retrofit; Easy to shut down when energized; There is no need to worry about the positive and negative cracking voltages.

2) The disadvantage is that a higher voltage than the target voltage is required; Affected by coils and capacitors; Not suitable for ultra-long-distance transmission.

Compared to direct current, alternating current can be easily converted through a transformer using a transformer, making it more suitable as a power source for infrastructure.