Humanity discovered electricity in the 18th century. In 1791, Luigi Galvani discovered that if a frog was connected to an electrostatic generator to form a closed circuit, and then the electrostatic generator was turned on, the frog's muscles would tremble. This experiment demonstrates that nerve cells rely on electrical media to transmit signals to muscles. He thus created the academic field of bioelectricity.
In 1800, Count Alexandre Volta soaked sheets of copper and zinc in salt water and connected them with wires to create the first battery: the voltaic battery, which can be called the ancestor of modern batteries. Voltaic cells offer scientists a more stable source of energy than electrostatic generators, capable of providing electric current continuously.
Detailed informationPrecautions for using electricity
1 Understanding the switchmain power switch and learn how to turn off the main power in an emergency.
2. When using electrical appliances, there must be a complete and reliable power cord plug. Electrical devices with metal housings must be protected by earthing.
3. Switches and fuses cannot be installed on the ground wire and neutral wire. It is prohibited to connect the ground wire to tap water or gas pipes.
4. Do not touch energized equipment with wet hands or wipe energized equipment with a damp cloth.
5. Do not connect wires indiscriminately or move energized equipment casually.
6. When inspecting and repairing electrical appliances, the power supply must first be disconnected.
7. When the power cord of an electrical appliance is damaged, replace itlace it up immediately or wrap it with electrical tape.
Baidu-Electricity Encyclopedia
What are the characteristics of high voltage power supply?
The circuit of a domestic circuit is as follows: electrical appliances are connected between the neutral wire and the live wire. The battery analogy is: connect a light bulb or something between the positive and negative terminals of the battery to form a circuit. A circuit is an electrical circuit that allows current to pass through electrical devices.
There are no positive and negative poles in domestic circuits.
Only when the neutral line and the live line form a closed loop can the electrical energy be used, that is, the electrical energy can be converted into another energy.
When an electrical device is connected between the neutral wire and the s wireou voltage and closed, there is also current in the neutral wire; if there is a separate neutral wire, there will be no current. The neutral line is actually a wire located next to the transformer with one end buried. Its function is to form a loop with the electrical devices and the live wire, that is to say, to circulate the current to earth. just an energy conversion tool.
During the peak period of electricity consumption, due to the limited supply of electric energy and the increase in the number of users, the required electric energy increases. Since P=UI, the power decreases and the bulb dims naturally!
The importance of high voltage power supply is to first choose a good grounding reference point. A good grounding point can be a metal pipe in the water system, a metal heating pipe, an underground pipe. in a line of alelectrical supply, or a metal pipe in a building, or a dedicated grounding terminal for a building. Use a thick wire to directly connect the corresponding ground terminal or ground base of the DC high-voltage power supply to the ground reference point you selected. Earth is still the universal and best reference point. Another important thing regarding grounding problem is the load loop grounding problem. The output end of the DC high voltage power supply is connected to the corresponding load. The other end of the load must return to the ground end of the high voltage DC power supply. to form a closed loop. This loop should be directly connected with a thick wire. Only in this way can it be ensured that the large instantaneous arc current has a known loop and will not affect other equipment with ground cosame reference point. . It is important to note here that the third ground wire of the AC power line is only used as a safety ground and is not a proper system ground. Do not attempt to use it as part of your grounding system.