(1) Resistance of various substances
All kinds of materials have different values ​​of resistance. Because of their different resistances, they can be attributed to conductors, insulators, poor conductors, and semiconductors.
(2) Insulation resistance
The insulator has the property of preventing the passage of current, but when a high voltage is applied, a small amount of leakage current flows through the inside or the surface of the insulator. Insulation resistance is the ability to prevent leakage currents from passing through. The larger the resistance, the better, usually in the millions of Euros (MΩ). The insulation resistance is reduced due to deterioration of the material, organic matter adhered to the surface, dust, water droplets, and the like.
(3) Electrolyte resistance
Distilled water was added to the vessel. When DC power was connected, almost no current flowed. However, if you add a little salt in distilled water, there will be current. The higher the salt concentration is, the larger the current is, and the salt (NaCl) in the solution is decomposed into sodium ion (Na+) and chloride ion (Cl-) due to ionization. This type of solution is called the electrolyte solution, such as salt can be decomposed into ions known as the electrolyte. When measuring the resistance of the electrolyte, AC power must be used to prevent the effect of polarization.
(4) Grounding resistance
The copper plate is buried in the ground (ground), and after the voltage is applied, the current flows in the direction of the arrow. This means that the earth is a large conductor, and the resistance between the copper plate and the earth is called grounding resistance. The resistance of the earth is related to the degree of soil, moisture, and electrolytes.
(5) Contact resistance
The switch of the circuit makes the current on and off, and the contact resistance exists when the blade (A) of the switch and the clip (B) are not completely connected. When the contact resistance is large, the current does not easily flow, and the contact portion easily generates heat and causes a failure.
All kinds of materials have different values ​​of resistance. Because of their different resistances, they can be attributed to conductors, insulators, poor conductors, and semiconductors.
(2) Insulation resistance
The insulator has the property of preventing the passage of current, but when a high voltage is applied, a small amount of leakage current flows through the inside or the surface of the insulator. Insulation resistance is the ability to prevent leakage currents from passing through. The larger the resistance, the better, usually in the millions of Euros (MΩ). The insulation resistance is reduced due to deterioration of the material, organic matter adhered to the surface, dust, water droplets, and the like.
(3) Electrolyte resistance
Distilled water was added to the vessel. When DC power was connected, almost no current flowed. However, if you add a little salt in distilled water, there will be current. The higher the salt concentration is, the larger the current is, and the salt (NaCl) in the solution is decomposed into sodium ion (Na+) and chloride ion (Cl-) due to ionization. This type of solution is called the electrolyte solution, such as salt can be decomposed into ions known as the electrolyte. When measuring the resistance of the electrolyte, AC power must be used to prevent the effect of polarization.
(4) Grounding resistance
The copper plate is buried in the ground (ground), and after the voltage is applied, the current flows in the direction of the arrow. This means that the earth is a large conductor, and the resistance between the copper plate and the earth is called grounding resistance. The resistance of the earth is related to the degree of soil, moisture, and electrolytes.
(5) Contact resistance
The switch of the circuit makes the current on and off, and the contact resistance exists when the blade (A) of the switch and the clip (B) are not completely connected. When the contact resistance is large, the current does not easily flow, and the contact portion easily generates heat and causes a failure.
Newland Magnetics Co., Ltd. , http://www.zj-magnets.com