Car generator wires cannot be called live wires and neutral wires. If they are called live wires and neutral wires, it will easily mislead and confuse with the AC power supply of household appliances. It is simply the positive pole and the ground (negative pole). ), and the car is powered by the battery and generator, most automobile electrical components are powered in parallel and have single-wire output. The negative electrode of the battery is connected to the car chassis and the engine body as a common wire.
Domestic 220V is alternating current. Just like the definition of alternating current, the current direction of household electricity also changes periodically. But why does domestic electricity have to come up with the concept of zero live wire. ? In physics, it has little to do with electricity. Can yourefer to electrical engineering.
Three-phase generator: Household electricity consists of a live wire (phase wire) and a neutral wire (neutral wire). Nowadays, power plants use a three-phase generator. produces electricity (it is recommended to search Baidu to better understand the difference between daily electricity and experimental electricity). The neutral line is the line drawn from the neutral point of the three-phase generator and the potential is 0.
Neutral line: the potential 0 at the neutral point is caused by the initial three phases φ of the generator being -2π/ respectively 3, 0 and 2π/3. If you still stick to physical electricity, it will be more difficult.
Live wire: The live wire is a line drawn from a node where the generator potential changes periodically (you can imagine it as a sinusoidal alternating current, this diagram ut since the three nodes are independent). , they don'twill not look like zero. If the line is stable at potential 0, it will also have an amplitude of +-220√2V.
How to operate electrical appliances: One end of the home appliance is connected to the live wire and the other end is connected to the neutral wire, then it forms an AC loop with one phase of the generator ( it depends on the phase your live wire is pulled from). The magnitude and direction of the current in the loop will change periodically, but the effective value (operating current) remains unchanged and the electrical appliance can operate normally.
Electric shock from live wires: The potential of live wires changes periodically (50, 60 Hz), and the potential of a person is the same as that of the earth. Once you touch the live wires, your contact point and. your feet will change periodically. Due to the difference in potential, you become an "elhousehold appliances" in 4. Current will flow back and forth in your body: 220V from live wire to earth, -. 220V from earth to live wire.
Alternating current is a current whose amplitude and direction are constantly changing. The frequency of the household current is 50 Hz, which means that the direction of the current changes 50 times per second The transformer is also dangerous. people touch both wires at this time. For safety reasons, connect one of the wires to ground. This wire is the neutral wire. The voltage between it and ground is 0. There is no danger for people to touch it. The other wire is zero. One is a live wire, and only contact with the live wire is dangerous.