How the electric pen works
1. Inert gas characteristics: ionization occurs when a certain voltage is applied, free charges are generated in the gas, and the free charges move directionally to form a current. When ionized, a glow is associated.
2. The human body is a conductor and can also be regarded as a large capacitor, which has the ability to charge and discharge.
3. The electric field between the live wire and the human body changes direction continuously with the change of the direction of the alternating current, and induces a voltage that constantly changes direction to the neon bubble, which causes the human body capacitor to continuously charge and discharge, and the induced current in the neon bubble is maintained, and Excite glow.
4. The glow current is weak and does not hurt the human body.
5. There is also alternating current in the zero line, but the potential relative to the human body is 0 volts, and no voltage current can be induced.
Electric test pen (also known as electric pen) is one of the commonly used tools of electricians to determine whether an object is charged or not. Its measuring range is between 60 and 500V, and it has pen type and screwdriver type. It consists of neon tubes (commonly known as neon bulbs), resistors, springs, etc. When in use, the charged body forms a potential difference between the electric pen, the human body and the earth to generate an electric field, and the neon tube in the electric pen will emit light under the action of the electric field. When using the electric pen, you must hold it correctly. The mother and middle fingers hold the insulating part of the electric pen, and the index finger presses the metal cap of the pen end.
