AC220V power supply means that the power supply voltage is AC 220V. AC current refers to AC current whose direction changes periodically with time. The running average value within a cycle is zero, and its direction changes with time.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
AC220V: refers to the AC voltage of 220V. Alternating Current (abbreviation: AC) refers to the alternating current whose direction of current changes periodically with time, and the running average value within a cycle is zero.
Unlike direct current, its direction changes over time, and direct current does not change periodically. DC power sources include chemical batteries, fuel cells, thermoelectric batteries, solar cells, DC generators, etc. Using direct current, water electrolysis experiments can also be carried out.
Insert the electrode into the water. The negative electrode can electrolyze water into hydrogen, and the positive electrode can electrolyze water into oxygen. In terms of power transmission, after the 1880s, due to the inconvenience of raising DC low voltage to high voltage for long-distance transmission, DC transmission gave way to AC transmission.
Since the 1960s, due to the use of high-voltage and high-power converters to convert DC power into AC power, the DC transmission system has received renewed attention and gained new development. AC power is widely used for power transmission because AC power transmission is more efficient than DC power transmission under previous technical conditions.
The power dissipated by the transmitted current on the wire can be obtained by Joule's law (P =I²Rt). Obviously, to reduce energy loss, it is necessary to reduce the transmitted current or the resistance of the wire.
Extended information:
1. Alternating current (AC) voltage
If the magnitude and direction of the voltage do not change over time, it is called direct current, such as dry batteries and storage batteries.
Electricity whose magnitude and direction of voltage change over time is called alternating current, such as 220V AC for civilian use, 380V AC for industrial use, etc.
2. Direct current (DC) voltage
A voltage whose magnitude and direction do not change with time is called direct current (DC) voltage.
In a DC circuit, the voltage applied across the power supply, a circuit, and a component is the DC voltage. For example, the voltage across the flashlight battery and the bulb is both 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 grid, connecting DC projects with the same voltage level into The network is far more economical and convenient than independent projects at different voltage levels.
Difference
1. Different current directions: alternating current (AC) flows out and back in two directions, and the size is constantly changing (the changing pattern of lighting electricity is sinusoidal). Frequency can be used to express alternating current. The speed of direction change can be expressed by phase as the starting time of AC power transmission.
Direct current (DC) has only one direction, that is: current can only flow from the positive pole to the negative pole.
2. Different uses: Common electric lamps, motors, etc. use alternating current;
Common various electronic instruments, electrolysis, electroplating, DC power drag, etc. use electricity. It's direct current.
3. Different output voltages: AC generally refers to the incoming voltage of the power supply between 220 and 250V. It is generally only used as the incoming line of household appliances, and there is also 380V (volt) commonly used in industrial production.
DC refers to the direct current power supply. Generally, there are several common voltages such as 3.0V, 6.0V, 9.0V, 12V, etc. Batteries and chargers are the most typical. Generally, the charger output is 4.5 Around V, the universal charger has a wider voltage range.
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