What is the difference between alternating current and direct current

Alternating current and direct current are widely used in our daily life, such as power grids, electrical appliances, etc., which will use alternating current or direct current. Some people don't know much about direct current and alternating current, and often confuse them together, so what is the difference between alternating current and direct current? Next, I will briefly introduce it to you.

1. The stability of direct current is better. Direct current flows in one direction and does not change due to the change of time, while the magnitude of the voltage is basically unchanged, and its stability is good. However, the flow direction and voltage of the alternating current will change repeatedly with time, and its changes are regular and periodic, and the stability is not as good as that of direct current.

2. The stability of direct current is good, and the power loss in the process of transportation is small, so some important places are powered by direct current, such as mobile communication stations; Moreover, direct current can be stored, and the more common application is batteries. Although there is a large loss in the transportation process of alternating current, the voltage can be changed to reduce the loss by installing a transformer; Its application range will be more extensive, such as the home grid is the use of alternating current, but alternating current cannot be stored.

3. Direct current and alternating current are not opposed to each other, and you can convert direct current into alternating current or alternating current into direct current through relevant equipment. For example, the socket in our home is AC, while the mobile phone is usually DC; Everyone uses a charger to charge the mobile phone, which is to turn the alternating current into direct current; This chain process usually goes through voltage transformation, rectification, filtration, and voltage stabilization, and generally uses rectifiers and filters.

Whether the home appliances use direct current or alternating current, everyone needs to pay attention to electricity safety during use.

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

The essential difference is that the magnitude and direction of the current remain unchanged in a certain time range for direct current, while the magnitude and direction of the current for alternating current show periodic changes.

The direct current transmission mode is superior to the AC transmission mode, and the AC transmission method replaces the DC transmission mode, which is only a technical reason in the history of electricity development. Therefore, the power transmission seen in daily life is mainly AC transmission.

Direct current belongs to constant current electricity, that is, its current is a constant state, the size, direction, etc. will not change, there are two kinds of positive and negative electricity, the current will only return from the positive electrode to the negative electrode under the action of the wire, and the direction of the alternating current will change periodically, and the average value of the current operation in each cycle is zero, which is mainly used to transmit electricity.

Home circuit renovation belongs to concealed engineering, so after the circuit is planned and designed, it needs to be slotted in the wall, floor and other positions, and there are many places that need to be paid attention to in slotting, for example, the load-bearing wall can not be slotted, which will affect the load-bearing of the entire building, and the wall should not be opened transverse groove, even if it is a transverse groove, its width should not exceed 30 cm, and the length should not exceed 2 meters.

The cable must be connected with a pipe Jingzu:

Experts introduce that the transformation of home circuits is to make it more convenient to use electricity and use electricity more safely, so the wires used in the home need to be penetrated into the pipe and then buried in the pipe to repair the groove, if it is directly buried, it is easy to age, and the later maintenance is also inconvenient, and the wiring maintenance can not be directly carried out, and it may be necessary to carry out a large-scale renovation, which is very unfavorable.

To put it simply, AC is the 220V electric resistance spine, while DC is the electricity of a dry battery.

Direct current refers to an electric current whose magnitude and direction do not change with time, while alternating current refers to an electric current whose magnitude and direction change periodically over time. Many electrical appliances, such as radios, speakers, and many other appliances that do not contain inductive components, are driven by direct current. As for the transmission of electricity, alternating current is widely used in the transmission of electricity, because under the previous technical conditions, alternating current transmission is more efficient than direct current transmission.

Direct current (DC) and alternating current (AC) are the two basic forms of electric current. The main difference between them is the way the direction of the current and the magnitude of the current.

Direct current is an electric current that remains in the same direction.

In direct current, electrons flow in only one direction in a circuit. Direct current is characterized by a stable current and constant direction, and a constant voltage. Therefore, direct current is often used in devices that require stable current and voltage, such as batteries, electronics, computers, etc.

Alternating current is an electric current that periodically changes in the direction and magnitude of an electric current at a certain frequency.

In alternating current, the direction of the current changes repeatedly, and electrons flow back and forth in the circuit. Alternating current is characterized by the change of current and voltage over time, and its frequency is usually 50Hz or 60Hz (depending on the country and region). AC power is widely used in the fields of household electricity, industrial electricity and energy transmission.

There are also some differences between direct current and alternating current in terms of application and characteristics. Direct current has stable current and voltage characteristics, making it suitable for devices that require a stable power supply. Alternating current has the advantage of being able to withstand voltage regulation and energy transfer through transformers, making it more common for energy transmission and virtual chain transmission over long distances.

In addition, DC and AC have different levels of safety. Since the current direction of direct current does not change frequently, it is less harmful to the human body. However, the current direction of alternating current changes frequently, which has a greater impact on the human body, so corresponding safety measures need to be taken.

The difference between direct current and alternating current is in terms of how it is generated, how it is used, and how it is delivered.

Additional Knowledge:

1. Definition of direct current and alternating current

Direct current refers to an electric current that remains in the same direction, while alternating current refers to a current that changes back and forth in direction. Direct current is generated by devices such as batteries, whereas alternating current is generated by alternating current sources. These two currents are very different in terms of transmission, use, and equipment.

2. The difference between direct current and alternating current

1) The way of generation is different

Direct current is generated by batteries or DC generators, whereas alternating current is generated by alternators.

2) Different fields of application

Direct current is suitable for some specific equipment, such as electronic equipment, telecommunication equipment, and lighting equipment. AC power is suitable for most electrical equipment, such as washing machines, refrigerators, and air conditioners.

3) The conveying method is different

Since the voltage change of direct current is small, it can be transmitted over long distances using the conductor of the common and auspicious wire. However, the voltage and frequency changes of alternating current lead to large line losses, and special high-voltage transmission lines are required for long-distance transmission.

3. Precautions for direct current and alternating current

First of all, direct current and alternating current cannot be mixed. If AC power is connected to DC equipment, the equipment will be damaged immediately. Conversely, if DC is connected to an AC device, the device will not work properly.

Second, pay attention to safety. When operating electrical equipment, safety regulations must be followed to avoid accidental injury.

4. Application of direct current and alternating current

For example, in terms of long-distance power transmission, DC transmission has gradually become the mainstream due to the line loss of alternating current; In some distributed generation systems, the use of direct current is becoming more and more extensive. Therefore, understanding the difference between direct current and alternating current is very important and beneficial for practitioners and amateurs in the power industry.

In general, in the design, manufacture and use of power equipment, the selection and application of current types must be fully considered to ensure the normal operation and safety of the equipment.

1. The variation characteristics of the two are different.

The magnitude and direction of the current of alternating current will change periodically with time, and the average operating value in a cycle is zero, usually the waveform is sinusoidal, while there is no periodic change in direct current.

2. The two are produced in different ways.

Alternating current is magnetic-based, mechanically generated, where alternating current must have electromagnetic characteristics, there is a magnetic core material. Direct current is chemical-based, whether it is photovoltaic, lead-acid balance skin, and chemical energy is mainly converted to electrical energy.

3. The transformation methods of the two are different.

AC to DC is through rectification + filtering, to get pulsating DC. Direct current to alternating current is converted to alternating current through oscillation + inverter to obtain alternating current of various sine waves in Huai Hall. Alternating current is easy to transmit, electronic DC power supply is the mainstay, magnetic-based electrical appliances can directly use alternating current, and resistive AC and DC dual-use.

Direct current is the one-way flow or movement of electric charges, usually electrons. The current density varies over time, but the direction of movement is usually the same over all times. As an adjective, DC can be used as a reference voltage (its polarity never changes).

In a DC circuit, electrons are formed from the cathode, anode, and negative electrode, and move towards the anode, positive, and positive magnetic electrode. However, physicists define direct current as the movement from the positive electrode to the negative electrode.

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.

Usually the AC waveform is sinusoidal. Alternating current can transmit electricity efficiently. But there are actually other waveforms that are used, such as triangular waves, square waves. The mains power used in daily life is alternating current with a sinusoidal waveform.

Direct current and alternating current are the most basic ways to use electricity in daily life, but many people do not know much about the difference between direct current and alternating current, so let's take a look at what is the difference between direct current and alternating current and what are the advantages and disadvantages of alternating current and direct current.

1. What is the difference between direct current and alternating current.

The change characteristics of direct current and alternating current are not the same, direct current will not appear cyclic fluctuation, and the current size of alternating current will change with the change of time, and the generation mode is not the same, direct current is converted from chemical energy to electrical energy, and alternating current is generated by mechanical means, so it has electromagnetic characteristics.

2. What are the advantages and disadvantages of alternating current and direct current?

1. Even in the case of long-distance transmission of alternating current, the power can be transmitted to a long distance by stepping up, and then the voltage of the power is lowered by the step-down device for the use of residents and factories, and in the case of consistent power generation, the power generation equipment of alternating current will be more convenient to operate.

2. The disadvantage of alternating current is that most of the household appliances currently use direct current, so the alternating current needs to be rectified and filtered before it can be used.

3. The biggest advantage of direct current is that there is no need to pass through the rectifier filter equipment when using, but in the process of direct current lifting and stepping, the voltage converter shall not be used, and special electronic circuits need to be used to achieve the purpose of stepping down and rising the voltage.

Summary: What is the difference between direct current and alternating current, the relevant content is introduced here, Lu Zheng In short, there are many differences between direct current and alternating current, and because the components of the DC transformer are more complex, alternating current has a great advantage in debugging. If you want to know more about decoration, you can pay attention to the relevant information of Qeeka Home.