What are the precautions for using a zinc oxide lightning arrester tester?

The difference between the resistance and resistivity tested by the grounding resistance tester

1. The characteristic that hinders the flow of free electrons and current is usually resistance. On the contrary, a specific resistance with a specific size is determined by the resistivity.

2. Resistance is related to specific conductors; On the other hand, electrical resistivity is related to the material of the conductor.

3. In conductors, resistance is the ratio of the potential difference through which current passes, while resistivity is typically the ratio of the electric field strength to the current density occurring at a specific temperature.

4. The unit of resistance is ohms (Ω), while the unit of resistivity is usually an ohmmeter (Ω m).

5. The resistance symbol is R; On the contrary, the symbol for resistivity is ρ。

6. In a constant metal wire, the resistance is proportional to the length and inversely proportional to the cross-sectional area; On the other hand, the resistivity depends on the temperature of the metal wire, but is independent of its size.

7. Resistance is determined by temperature, the material of the object, and its size, and is considered an attribute of a specific object; On the contrary, electrical resistivity is usually a specific property of a specific material.

8. The resistance formula is written as R=V/I or R= ρ (L/A); On the other hand, the formula for resistivity is written as ρ = (R) × A) /L.

9. The application of resistors in daily life is used in various places and things such as fuses, heaters, sensors, etc.; On the other hand, the application of resistivity involves calcareous soil and quality control testing.

Weshine Electric Manufacturing Co., Ltd.