Is household electricity DC or AC?

Household electricity is alternating current, and alternating current is more convenient to use.

1. Moreover, after the transformer boosts and lowers the voltage of alternating current, the efficiency of long-distance power generation is higher, and the transmission voltage is relatively fast, so it is suitable for household use. Both the TV and computer chargers used are DC.

2. The electricity used is divided into two types: the neutral line and the live wire, for example, the current of electricity used at home is 22V, then the electricity produced by the neutral line is V, because the time of the live wire is different, when there is electricity, the current is transmitted in one direction, and when there is no electricity, the current is transmitted in the other direction, so that the alternating current is formed, which is called alternating current.

As long as the electricity for household use is the electricity in the place where you want to pay the electricity bill to the power supply bureau, it is alternating current, and when you say "the direction does not change", you mean that the position of the live wire and the neutral line does not change, right? This problem should be understood in this way: the frequency of alternating current in China changes the "direction" 50 times per second, and the civil electricity is alternating current with "220V 50Hz" per phase; In the whole power supply system, only the live wire has voltage, and the neutral line is the "neutral point" of the system, which should not have voltage under normal circumstances.

Although the alternating current changes the size and direction of its current every second, as a household single-phase power supply, the neutral wire is only used as a "loop" for this phase wire, that is, it is just a current path for this phase wire, and the current passing through the phase wire is returned to the power supply end by using the neutral point. And because the neutral point is "zero potential" and not charged, in the home you will always feel that one line is zero and the other is the fire wire and does not change. But in fact, even the live wire you are using, the magnitude and direction of the current are constantly changing every second (you can see the change with an oscilloscope).

It may not be clear or theoretical, but I think that's what it means, so don't laugh at it.

Household appliancesAlternating current, AC220V is commonly used; Mobile phones, batteries, flashlights, etcDirect current

Difference Between AC and DC:

Alternating current: The size and direction of the hall change periodically. In life, plug-in wall appliances use civil AC power supply.

Direct current: The direction does not change over time. The removable external power supply used in daily life provides direct current.

Alternating current is widely used in family life and industrial production, and the domestic voltage is 220V and the general industrial voltage is 380V, which are all dangerous voltages.

Direct current is generally widely used in flashlights (dry batteries).

Mobile phones (lithium batteries) and other small household appliances, etc. Dry batteries (lithium batteries, storage batteries, etc.) are called DC power supplies. Because none of these power supply voltages exceed 24V, they are safe power supplies.

Direct current explained:

1. When DC transmission, the AC system on both sides does not need to operate synchronously, and the AC transmission must operate synchronously When AC long-distance transmission, the phase of the current will produce a significant phase difference at both ends of the AC transmission system.

2. The loss of DC transmission failure is smaller than that of AC transmission If two AC systems are interconnected with AC lines, when a short circuit occurs in one side of the system, the other side should transmit short-circuit current to the fault side.

3. In cable transmission lines, DC transmission has no capacitive current.

generated, while there is a capacitive current in the AC transmission line, causing losses.

The role of direct current: direct current is mainly used in various electronic instruments, electric desolation, electroplating, DC power dragging, etc. The direction of direct current does not change with time.

It is usually divided into pulsating direct current and steady current. For example, the voltage of about 300 volts in the power supply circuit in the color TV is the pulsating DC component, which can be removed by the capacitor. Steady current is ideal, and the magnitude and direction are constant.

Household electricity is used with 220V 50Hz alternating current. Because the electric energy emitted by the power plant belongs to alternating current, alternating current has more advantages in the transmission process, such as small loss in long-distance transmission, and can be used to boost and reduce voltage. Moreover, household appliances mostly use alternating current, and even if electrical appliances use direct current, it is relatively simple to convert alternating current into direct current.

Specifically, one of the wires in the two-prong socket is called the "neutral wire", and the voltage of the neutral wire is the same as that of the earth, so touching the neutral wire will not be electrocuted. The other wire is called the "live wire", and the voltage of the live wire is higher than the earth for a while, and lower than the ground for a while. Since the spike flow flows from high voltage to low voltage, the current sometimes flows from the live line through the electrical appliances and then back to the zero line, and sometimes flows from the zero line through the electrical appliances and then flows back to the fire line, each cycle is 1 50s, which is called 50Hz alternating current.

The biggest advantage of the lead group over direct current is that it is easy to change the voltage, so that high voltage transmission can be carried out to reduce losses.

Household electricity is alternating current.

Due to the convenience of power transmission and transformation, the drive motor is simple. However, household appliances are basically used by direct current, such as televisions, computers and chargers. In addition, household circuits are generally composed of two incoming wires, electric energy meters, knife switches, leakage protectors, insurance equipment, electrical appliances, sockets, wires, switches, etc.

Alternating current

The magnitude and direction of the current over time. 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, alternating current (AC) waveforms are sinusoidal. Alternating current can transmit electricity efficiently. Yu Sui actually has other waveforms, such as triangle waves, square waves. The mains power used in daily life is alternating current with a sinusoidal waveform.

Direct current

Also known as constant current electricity, constant current is a type of direct current, which is a direct current that does not change in size and direction, and it was discovered by Edison. In 1747, Benjamin Franklin of the United States proposed the law of conservation of electric charge based on experiments, and defined the terms of positive and negative electricity. A constant current means that neither the magnitude (voltage nor the voltage) nor the direction (positive and negative) change with time (within the relative range).

For example, we get a typical pulsating DC after the 50Hz AC is rectified by the diode, the half-wave rectification is accompanied by a 50Hz pulsating DC, and if it is a full-wave or bridge rectification, it is a 100Hz pulsating DC.

Whether household electricity is DC or AC, household electricity is undoubtedly alternating current, because alternating current is easy to transmit, and direct current is generally rarely used in places.

China's residential electricity is 220V AC.

If it is a single phase, you can arbitrarily connect the neutral wire and the live wire to the neutral wire and the live wire below the power switch, that is, the load side.

Mains power is the so-called power frequency alternating current (AC), which is characterized by three common quantities of alternating current: voltage, current, and frequency. There are two types of AC frequency commonly used: 50Hz (Hertz) and 60Hz (Hz), and the civil AC voltage distribution ranges from 100V to 380V.

Generally, three-phase 380V, 50Hz mains power is introduced into the computer room as the power supply, but the power rectifier module of the equipment uses a single-phase 220V voltage.

1. Household electricity is alternating current, which is more convenient to use.

2. Moreover, after the alternating current is boosted and lowered by the transformer, the efficiency of long-distance power generation is higher, and the transmission voltage is relatively fast, so it is suitable for household use. The TVs and computer chargers we use are both DC current.

3. The electricity we use is divided into two kinds: zero wire and live wire, for example, the current of electricity at home is 220V, then the electricity produced by the zero line is 0V, because the time of power output by the live wire is not the same, when there is electricity, the current is transported in one direction, and when there is no electricity, the current is transmitted in the other direction, so that the alternating current is formed, which we call alternating current.

It should be noted that it is best not to use various electrical appliances when thundering and raining, because the outdoor voltage is very high at this time, and the indoor voltage is lower than the outdoor, so that the current reaction will be generated, and the external pressure will enter the indoor damage to the electrical appliances, which can seriously lead to fire.