What interface is dc in?

dc in refers to the power interface, that is, the power plug connection; the DC in interface is the DC voltage input port. Direct current is also called "constant current", and constant current is a type of direct current, which is the size and direction. DC current is unchanged.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

dc in refers to the power interface, DC power interface.

DC-IN is a direct current input line.

Direct Current (DC for short), also known as "constant current", constant current is a type of direct current. It is a direct current that does not change in size and direction. It was discovered by Edison.

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

Extended information:

Advantages of DC

1. When transmitting the same power, the wires used in DC transmission are only 2/3 to 1/2 of AC transmission.

DC transmission adopts a two-wire system, with the earth or seawater as the return line. Compared with the three-wire three-phase AC transmission, under the conditions of the same cross-sectional area of ​​the transmission line and the same current density, even if the trend is not considered, Even without the skin effect, the same electrical power can be transmitted, while transmission lines and insulation materials can be saved by 1/3.

2. In cable transmission lines, DC transmission does not produce capacitive current, while AC transmission lines have capacitive current, causing losses.

Due to the coaxial capacitor formed between the cable core and the earth, in AC high-voltage transmission lines, 2.6×107kw/h is consumed every year on every kilometer of transmission line. In DC transmission, because the voltage fluctuation is very small, there is basically no capacitive current added to the cable.

3. During DC power transmission, the AC systems on both sides do not need to run synchronously, but AC power transmission must run synchronously.

When AC power is transmitted over long distances, the phase of the current will produce significant phase differences at both ends of the AC transmission system; although the frequency of AC power in each grid-connected system is stipulated to be unified at 50HZ, in fact it often fluctuates.

These two factors cause the AC system to be unable to operate synchronously. It requires a complex and huge compensation system and highly comprehensive technology to adjust it. Otherwise, a strong circulating current may be formed in the equipment to damage the equipment, or cause Asynchronous operation of power outage accidents.

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