The potential of the neutral wire is fixed. When the potential of the live wire is greater than the potential of the neutral wire, current flows from the live wire to the neutral wire. When the potential of the live wire is lower than the potential of the neutral wire, current flows. in the opposite direction. For example, you sit still and receive an infusion from the IV tube. When the infusion bottle is up, the infusion is infused from the infusion bottle into your body. When the infusion bottle is low, the flow in the infusion tube is reversed. direction. You are always stationary, equivalent to the neutral line, and the height of the hanging bottle always changes up and down based on the sine wave, so the direction and magnitude of the current always changes. The neutral line potential is always consistent with the ground potential (unless left floating), so it doesn't shock people. The ppotential of the live wire is either high or low at any instant (only the two moments are equal), so the live wire is the cause of the potential difference (between the neutral wire and earth), and is also the cause of the current, this is called live wire propagation. You touch the live wire, and at any moment either current is poured from the live wire through you to the ground, or current is poured from the earth through you to the live wire, sawing d back and forth, sawing you 100 times per second. , why not electrocute people?
Also, you are wrong that the live wire has a fixed tension. 220 V is only an effective value. The potential of the live wire changes all the time. Take a look at the electrician's book for. see how the live wire changes during a cycle. How many times is it at zero potential, how many times is it at 220 V, how many fois is the maximum value, what is the maximum value, please tell me.
In alternating current, how does the voltage return from the neutral line to the live line? How can the potential of the live line be lower than that of the neutral line of a single-phase generator? are there two wires coming out?
A light, a zero and two wires are connected to the house without distinguishing the neutral wire and the live wire. The ground wire is for protection. For example, if it is a generator. produces electricity with a motor, the ground wire must be connected to the ground wire. The motor housing is connected. Of course, there must be a leakage protection switch between the generator and the motor. The generator should be connected to the input interface of the leakage protection switch. The generator ground wire cannot be used as a neutral wire. All electrical equipmenthigh voltage must be used in accordance with regulations, otherwise it is dangerous if you are. connected to a ground that has no voltage, do not connect it to your house, this may cause the generator shell to charge, which is dangerous! ! ! !
1. In alternating current, the live line voltage ends after passing through the load and reaching the neutral line, and does not return to the live line from the neutral line.
2. A single-phase generator has two output lines, one hot and one zero. Simply connect two of the two lines in parallel and pass through the diode excitation coil.
3. In three-phase alternating current, the phase voltage refers to the voltage of the phase line and the neutral line, so the direction of the phase voltage points to the neutral line.
Electromotive force refers to the electrical power, which is the force inside the power supply.on electric which drives the current.
The vector sum of the phase voltages is zero, which refers to the vector sum of the zero line in star connection, not at the end of the load.
To understand these problems, you need to have a solid basic knowledge of electrical engineering.