four core factors affect the resistance :
The resistance of a conductor is mainly determined by the following four core factors:
| Factors | Relationship with the resistance of a conductor |
| 1. The material itself (resistivity ρ) | Different materials inherently have different conductivity. |
| 2. Length (L) | Directly proportional: The longer the conductor, the greater the resistance. |
| 3. Cross-sectional area (A) | Inversely proportional: The larger the cross-sectional area (the thicker the conductor), the lower the resistance. |
| 4. Temperature (T) |
The effect of temperature on resistance depends on the material of the conductor. |
| The relationship between the four factors is: Resistance (R) = Resistivity (ρ) × Length (L) / Cross-sectional area (A). | |
Material Types (Resistivity ρ)
Different materials inherently have different electrical conductivity
| Material | Resistivity (20℃) | Conductivity |
| Silver | 0.016 Ω·mm²/m | Best (Most Expensive) |
| Copper | 0.0172 Ω·mm²/m | Excellent (Most Commonly Used) |
| Gold | 0.024 Ω·mm²/m | Very Good (Used for Precision Contacts) |
| Aluminum | 0.028 Ω·mm²/m | Good (Lightweight, Used for Overhead Lines) |
| Iron | 0.097 Ω·mm²/m | Poor |
| Steel | 0.14-0.20 Ω·mm²/m | Very Poor |
The effect of temperature on resistance
| Material Type | Temperature Increase | Typical Examples |
| Metallic Conductors | Resistance Increases | Copper, Aluminum, Iron |
| Semiconductors | Resistance Decreases | Carbon, Silicon |
| Insulators | Resistance Decreases | Rubber, Plastics |
Products Description
"XDTZ uses high-quality copper as the primary material for all conductive components - from contact arms to main busbars. Compared to aluminum, copper offers lower resistivity, higher current carrying capacity, and better long-term reliability. For critical electrical connections, we choose copper. Because safety is not an option."
24kV Contact Arm for Vacuum Circuit Breaker is used for withdrawable indoor high-voltage vacuum circuit breaker, suitable for rated voltage 24kV power equipment, and is an important component of the electrical system.
Our address
No. 1 East Gaoxin Avenue, Baoji, Shaanxi, China
Phone Number
+86 180 9176 5658
xdtz03@westpowerelectric.com
