Earth is generally considered to have absolutely zero potential, but the neutral line (that is, the neutral line of three-phase alternating current) does not necessarily have zero potential. If the voltage from the fire to the ground is 220 V, this means that the potential of the live wire is 220 V; if the zero to ground is 110V, that means the neutral line also has a potential of 110V. Your neutral line may not be grounded, and the other end. of the neutral line (referring to the front end of your voltage measurement) has poor contact, so there are areas with poor contact. Charge is generated, resulting in a potential on the neutral line, hence when measuring zero-to-ground voltage. , there will be voltage.
220V is the voltage. This value appears because the voltage sent from the power station to the user is 220 V
As for why it can be connectedtee: Because the earth is a conductor, when the live wire is connected to the earth, there is a voltage and a conductor, and the current will naturally occur. It's not like you are saying that the negative pole of the generator is connected to earth Haha, there is one more thing to correct: the terms positive and negative are used in direct current. The electricity we use is alternating current (50 Hz). There is no positive pole.
You can get an electric shock even if you stand on the ground in a 100-story building and touch live wires with your hands. It has nothing to do with the distance from the horizontal plane. There are two conditions for current generation: voltage and conductor. As long as the conditions are met, current will be generated.
Children, don't try randomly. The speed of electricity propagation is equivalent to the speed of light, and you don't have the ttime to hide.
However, there is a way to touch live wires when there is electricity without experiencing an electric shock. But since you are relatively young, I won't tell you just yet.
When you learn physics, you will naturally understand
Pay attention to safety, electricity is very dangerous