On the question of zero live wire in electrical appliances Please don t elaborate on the principle o

The difference between the second hole and the third hole is that the third hole has an extra grounding wire.

The electrical appliances you are talking about come with plugs, why don't you divide the zero line and live wire on the socket: any AC 220V electrical appliance can not be divided into the zero line of the live wire, that is to say, the voltage of a live wire is 220V, the zero line is the return line, and it does not have a voltage, as long as the live wire and the zero line form a loop, the electrical appliance can work normally.

Because the electrical appliances themselves must also be controlled by switches, and the switches of some electrical appliances control a wire, according to the regulations, the switch must control the live wire, so it is necessary to distinguish the fire zero. If you use an electrical appliance that is controlled by both switches, there is no need to separate the fire wire and the neutral wire.

This problem is very simple, the difference between the two-pin plug and the three-pin plug is that there is one more ground wire, the principle is the same, you know that you have studied physics, all circuits are not a wire that can form a current, so whether it is a live wire or a neutral line, it passes through the electric load at the same time, I don't know if you understand.

The socket theoretically has the ground wire in the left zero right fire, the zero wire and the live wire interchange equipment can work normally, the zero wire has the same current as the live wire, the live wire has a voltage, if the person is not insulated, there will be a risk of electric shock, the zero line has a current, the voltage is normal at about 0-15V, there is a hole in the middle is a protective grounding, and the equipment shell is connected to the 0 potential, to ensure that the equipment shell is not charged,

In the low-voltage distribution network, the transmission line generally adopts the three-phase four-wire system, in which three lines represent A, B, C three phases, and the other is the neutral line N (if the neutral point on the power side of the circuit is grounded, the neutral wire is also called the neutral line, if it is not grounded, then the neutral wire cannot be called the neutral line in the strict sense). In the single-phase transmission line entering the user, there are two lines, one we call the live line, and the other we call the neutral line, the neutral line normally passes the current to form the circuit of the current in the single-phase line. In the three-phase system, when the three-phase is balanced, the neutral wire (neutral line) is current-free, so it is called the three-phase four-wire system; In the 380V low-voltage distribution network, the N-line is set up to obtain the 220V phase-to-phase voltage from the voltage between the 380V lines, and it can also be used for zero-sequence current detection in some occasions to monitor the balance of three-phase power supply.

Live wire, neutral wire is a colloquial term in AC circuits.

The live wire refers to any of the three phases of ABC, i.e., the three wires that are "electrified", and the neutral wire is the one that is not electrified. AC transmission line adopts three-phase transmission, to the distribution transformer before it is introduced to the user, if there is no need to use three-phase alternating current, generally only lead out a phase wire (live wire) and neutral wire to the user to meet the general electricity demand.

To put it simply, the live wire is live (the voltage to the ground or to the neutral line is 220V), and the neutral wire is not electrified.

Under normal circumstances, the live wire is live, the neutral wire is not live, and the voltage difference between the live wire and the neutral wire is 220V. When the three phases are unbalanced, or when the neutral live wire is connected incorrectly, it may be electrified.

There are two wires in the lighting circuit, one is called the live wire, and the other is called the neutral wire. The difference between the live wire and the neutral wire is that they have different voltages to the ground: the voltage of the live wire to the ground is 220v; The voltage of the neutral line to the ground is equal to zero (which itself is connected to the earth).

The live wire is a live wire, and the neutral wire is the wire drawn from the neutral point of the transformer, which is theoretically uncharged.

The live wire is live (220V) The neutral wire is not electrified, if it is electrified, it will be a big problem, and the voltage difference between the live wire and the neutral wire is 220V

The live wire is electrified, the neutral wire is not electrified, and if the neutral wire is electrified, there is a problem.

Summary. The main reasons for zero wire burning are:

The terminal is not securely connected and needs to be checked;

The neutral line is overcurrent and overloaded.

The first one is easier to find, and the second one can be used with a clamp multimeter and the card master zero line measurement to check whether the zero line current is too large.

Explanation: Is the load of the neutral line the same as that of the live wire in the use of alternating current?

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Hello, the load of industrial electricity is not the same, and the household is the same as the positive code shutdown. It is often seen that the zero line in the three-phase four-wire or the three-phase five-wire is much thinner than the phase line, because the three-phase cracked phase wire in the three-phase electrical equipment can form a loop, and the commonly used motor triangulation method does not use the zero line, and the star connection zero line is dispensable. When household electricity is used, the phase line and the neutral line form a loop.

I hope my Li Chaichang can help you, and I sincerely hope that you can move your little finger of love to light up Zhaowan praise for me, your affirmation is very important to me, hard work-

Can the three-phase circuit be tolerated?

OK. Typing speech is not audible.

Why is there a time to burn the zero line?

The main reasons for zero wire burning are: the terminal is not firmly connected, which needs to be checked; The neutral line is overcurrent and overloaded. The first kind of source state is relatively easy to find, and the second kind can be used with a clamp-type multimeter to measure the main zero line of the card to check whether the zero line current is too large.

In order to generate current in a circuit, there must be a voltage at both ends of it (the voltage is the self in the circuit.

It is determined by the occurrence of charge.

to the cause, the formation of the current). The power supply provides the voltage, which causes the formation of an electric current. (Note: There must be voltage when there is current, but there is voltage but not necessarily current).

The neutral line is the ground wire, so the voltage between the neutral line and the earth is 0.

If a person stands on the ground and the insulation conditions are not good, the fire wire in his hand will be electrocuted. And holding the neutral wire in your hand will not be electrocuted. Pay attention to the two scenarios of electric shock.

The human body is a conductor. When the human body becomes part of a closed circuit, an electric current passes through it, and if the current reaches a certain size, an electric shock accident occurs.

If one hand of a person touches the live wire and the other hand touches the neutral wire, then the human body and the wire constitute a closed circuit, and the current flows through the human body, and an electric shock accident occurs.

If one hand of a person touches the live wire, although the other hand does not touch the neutral wire, because standing on the ground, the wire, the human body, and the earth also constitute a closed circuit, and the current will also flow through the human body, and an electric shock accident will occur.

In addition, there are some conditions that can cause electric shock. For example, the insulating skin is damaged, the chassis is not grounded, clothes are dried on the wire, and the TV antenna is in contact with the wire.

From this, it can be seen that there are two types of electric shock: one is to contact the live wire and neutral wire at the same time, and the other is to contact the live wire.

I hope it helps you, and if you have any questions, you can ask them

I wish you progress in your studies and go to the next level! (*

This little fellow asked a good question, said.

Bai Ming: You have a lot of brains. But du

Since you have limited content to learn now, these seem to be profound questions that are difficult for you to understand. But I can give you a brief explanation.

The current we use is three-phase alternating current and one phase, or single-phase alternating current.

The three live wires of the three-phase alternating current are all sent from the generator, and people will be electrocuted after connecting them. But the current flow direction and size of these three live wires are different, the positive direction of the first phase current is the largest at a certain time, and the other two phase currents are all negative directions, and the sum of the currents in the two negative directions is exactly offset with the current in the positive direction of the first phase, if the three live wires are connected together, and then connected back to the generator with a wire, the current in this wire is zero, but the three live wires all form a path. This wire with zero current is called the zero wire.

Usually, the voltage of household alternating current is 220V, which means that the voltage of each live wire to the ground is 220VWhereas, the neutral line voltage to ground is zero.

Since there is no current in the neutral wire, and the voltage to the ground is zero, we can also connect this neutral wire to the ground. The three live wires output by the three-phase generator, and one more grounded, can also make the three live wires form a closed loop.

Isn't it all understandable to explain it like this?

You won't learn this until after high school. It's normal that you don't understand very well now.

To emphasize the first point, the essence of the current is the flow of charged particles from the source, and the charged particles are directed by the electric field force (in the wire, the field strength line follows the wire), that is, the current is formed.

An electric field is formed between two high and low potentials, that is, if the potential difference exists, the charged particles move directionally (while the current is the directional motion of a steady and continuous stream of charged particles).

Voltage is the potential difference, and the potential determines the direction of the current, just as water flows down.

The neutral line is connected with the ground, so that the neutral line and the earth are the same as the electric potential (the electric potential at any point on the conductor is the same, and the neutral line and the ground form a common conductor. Therefore, there is no potential difference between the earth and the neutral line, that is, the voltage; So there is no current. In the same way, the human body is also a conductor, and contact with the earth results in an equal electric potential with the earth.

Holding a live wire in your hand will cause you to be electrocuted because the electric potential of the live wire is always higher than that of the neutral wire (i.e. the earth) due to the continuous operation of the generator (usually 220V for household electricity). As a result, there is an electric potential difference between the part of the human hand touching the fire line and the ground under the feet (the above 220 V), and the electric potential difference does not change (too few charged particles flow to the earth to have no effect on the electric potential of the earth (set to 0)), which leads to the generation of electric current. If you stand on an insulator and touch the live wire, no electric current will be generated (at most, in order to achieve the same electric potential as the live wire, a small number of charged particles will flow into the body at first, which will not cause an electric shock).

Power zero line and earth.

Connection, the power live wire source forms a closed loop with the ground through the load.

The center tap (neutral line) of the star generator is grounded, so there is no voltage, the line voltage is 380V, and the phase voltage is 220V.

Holding the live wire in hand, the 220V voltage forms a loop through the grounding of the human body, so it is electrocuted. However, there is no pressure difference in the neutral line, and it will not be electrocuted even if it forms a circuit.

First of all, the zero line complex is also from.

The electrodes of the power supply (you can understand it this way) are connected to the earth, and then to your home.

Secondly, the live wire is connected from the other electrode of the power supply (you can understand it this way), which means that both the neutral wire and the live wire are drawn from the two electrodes of the power supply, and there is already a voltage of 220V between them.

Again, when the live wire and the neutral wire are connected, in fact, the two electrodes of the power supply (you can understand it this way) are directly connected together with two wires, which naturally constitutes a closed loop (in fact, it is a short circuit), which not only has current, but also has a large current.

Finally, voltage and current are two different things, when forming a closed loop, there is a current between the live wire and the neutral line and the electrical appliances connected to it, which has nothing to do with the earth, if there are still questions, please continue to ask!

The zero line is always equipotential with the earth.

, hence the alternating current.

A complete period of the live wire is that if it is the same as the neutral potential at 0 seconds, the voltage of the live wire to ground is 0; After a few seconds, the voltage to the ground on the live wire reaches a maximum of 318V above the ground; After another second, the voltage on the live wire to the ground drops to 0 again; After another second, the voltage on the live line to the ground dropped to the lowest point, which was 318V lower than the ground; After another second, it rises again to the same potential as the neutral line, and the voltage to ground on the live wire is 0.

It can be seen that although the alternating current changes the direction of the current periodically, the voltage of the neutral line to ground is always the same, which is 0. After connecting the electrical appliances, there is a current on the neutral line, and the current change law is the same as the voltage.

Not all electrical appliances have a neutral line on the left and a live wire on the right, and you can see the color.

There are generally three types of household wires, which are live wires, neutral wires, and ground wires, and most electricians will use different colors to distinguish them. In general, the yellow, green, and red wires are used as live wires for three-phase electricity, while the light blue wires are neutral wires, and the yellow-green wires are ground wires.

In addition, the representation of the live wire, the neutral wire and the ground wire is also different, in general, the live wire is N, the neutral wire is L, and the ground wire is PE.

Alternating current. It is a reflow. A home AC TV with a live and neutral wire, with a positive charge.

One will flow from the line of fire, and the other will flow from the line of zero. This understanding is not rigorous and comprehensive, but it is not wrong.

Here are a few additional knowledge points::

The energy that drives the flow of the charge is called the electric potential (electric potential energy), and the energy that it takes to flow the charge from one location to another is called the potential (the unit of measurement of potential and potential is called voltage). Electricity always flows from a place with a high voltage to a place with a low voltage. So without voltage, no current can be formed.

Alternating current is when the voltage on two wires is constantly changing. However, there must be a benchmark (standard) for high and low voltage.

The zero line is the prescribed standard. It is specified that the voltage of the neutral line is zero, then the other wire (phase wire.

or called the live wire) The voltage of the neutral line is the voltage of the power supply.

It is not enough to stipulate the zero line as a standard, and the voltage of the zero line is still different for the electricity generated by different engines. Therefore, it is necessary to connect the zero line directly to the earth. In this way, the benchmark of the supply voltage becomes the earth.

Under normal circumstances, the voltage of the neutral line is the same as that of the earth, and when everyone says the power supply voltage, they are talking about the voltage to the earth.

Since it is stipulated that the earth and the zero line are "zero", it cannot be said that "the charge will flow from the fire line and will flow from the zero line", but "the charge will flow from the fire line and out of the fire line".

The difference between the neutral wire and the ground wire is that the neutral wire is used for power supply, and the ground wire does not supply power.