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This article mainly introduces what ac220v power refers to, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand it.

AC220V power supply means that the power supply voltage is 220V alternating current. Ac current means that the direction of current changes periodically with time. The average value of AC current in a cycle is zero, and its direction will change with time.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

AC220V: refers to the alternating current voltage of 220V. Ac current (Alternating Current, abbreviation: AC) refers to alternating current whose direction changes periodically with time. The average value of AC current in a cycle is zero.

Unlike direct current, its direction changes over time, and direct current does not change periodically. DC power supplies include chemical cells, fuel cells, thermoelectric cells, solar cells, DC generators and so on. The experiment of water electrolysis can also be carried out by using direct current.

If the electrode is inserted into the water, the negative electrode can electrolyze the water into hydrogen, and the positive electrode can make the water electrolysis into oxygen. In power transmission, DC transmission has given way to AC transmission since the 1880s, because it is not convenient to raise DC low voltage to high voltage for long-distance transmission.

Since the 1960s, due to the use of high-voltage and high-power converters to turn DC into AC, DC transmission system has been paid more and more attention and achieved new development. Ac power is widely used in power transmission, because AC transmission is more efficient than DC transmission under previous technical conditions.

The dissipated power of the transmitted current on the wire can be calculated by the Joule law (P = I ²Rt). Obviously, to reduce the energy loss, it is necessary to reduce the transmitted current or the resistance of the wire.

Extended data:

1. Ac (AC) voltage

Voltage magnitude and direction do not change with time is called direct current, such as dry cells, batteries.

The magnitude and direction of the voltage change with time, such as alternating current 220V civil power, industrial power 380V and so on.

2. DC (DC) voltage

A voltage whose magnitude and direction does not change with time is called a DC voltage.

In a DC circuit, the voltage applied at both ends of the power supply, at both ends of a circuit and at both ends of the components is the DC voltage. For example, the voltage at both ends of the flashlight battery and the light bulb is DC voltage.

DC transmission technology has developed from simple end-to-end projects to large-scale multi-terminal transmission. These projects will be part of the future DC power grid. Connecting DC projects of the same voltage level into a network is far more economical and convenient than independent projects under different voltage levels.

Difference

1. The direction of current is different: alternating current (AC) flows out and back in two directions, and the magnitude is constantly changing (the changing law of illuminating electricity is sinusoidal). The speed of alternating current direction change can be expressed by frequency, and the starting time of AC power transmission can be expressed by phase.

Direct current (DC) has only one direction, that is, the current can only flow from the positive to the negative.

2. Different uses: the common lights, motors and so on are all alternating current.

The electricity used in all kinds of common electronic instruments, such as electrolysis, electroplating, DC electric drive and so on, is direct current.

3, the output voltage is different: AC generally refers to the entry voltage of the power supply between 220V and 250V, which is only used as the entry line of household appliances, as well as 380V (volts) commonly used in industrial production.

DC refers to DC power supply. Generally, there are several common voltages, such as 3.0V, 6.0V, 9.0V, 12V and so on. The battery and charger are the most typical. The output of the general charger is about 4.5V, and the voltage value of universal charge is wider.

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