Use a 220V test pen to check accuracy. The international convention for a three-core socket is zero on the left, fire on the right, and ground in the middle. The four-conductor one has three-phase electricity, the bottom three are three live wires, and the top-middle one is usually a ground wire. There are also three fire connections and one zero connection. You can use an electric pen to detect live wires. The range of a multimeter should be greater than 380 V. The voltage between two live wires is about 380 V and the voltage between zero live wires is about 220 V. If the motor driven by the output turns at upside down, simply swap two live wires. Remember to turn off the power and pay attention to safety.
If the outlet is marked, L1L2L3 is the live wire, N is the neutral wire, and if there is an E, it is the ground wire.
Place a card and a prifive pin with three lights, a zero and a ground wire.
Domestic 220 V is alternating current Just like the definition of alternating current, the direction of current in household electricity also changes periodically. But why does domestic electricity have to come up with the concept. zero live wire? In physics, it has little to do with electricity. You can refer 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 on Baidu to better understand the difference between daily electricity and experimental electricity). Neutral line is the line drawn from the neutral point of the three-phase generator and the potential is 0.
Neutral line: 0 potential at the neutral point is proevoked by the three initial phases φ of the generator being respectively -2π/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 will 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)ent) 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. Because of the potential difference, you become an "appliance" in 4. Current will flow back and forth through your body. The direction of the current: 220V from the 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 household current is 50 Hz, which means that the direction of the current changes 50 times per second. The transformer is at the origin. Likewise, it is dangerous for people to touch both wires at this time. For security reasons, connect one ofs wires to ground. This wire is the neutral wire. The voltage between it and the earth is 0. There is no danger for people to touch it. One is a live wire, and only contact with the live wire is dangerous.