1. Superior Electrical Conductivity:
- Copper has significantly higher electrical conductivity compared to graphite. Its resistivity is approximately 1.68 × 10^-8 ohm-meters, while the resistivity of graphite can vary depending on its structure but is generally higher. Higher conductivity allows copper to carry electrical current more efficiently with lower resistance losses.
2. Lower Resistivity:
- The resistivity of graphite can also be influenced by factors such as temperature, impurities, and structural defects. Copper, on the other hand, has a relatively stable and low resistivity, ensuring consistent performance in electrical applications.
3. Ductility and Flexibility:
- Copper is highly ductile and can be easily drawn into thin wires without becoming brittle. This flexibility makes it convenient for various wiring configurations and allows for efficient installation in complex electrical systems. Graphite, on the other hand, is more brittle and less suitable for these types of applications.
4. Oxidation and Corrosion Resistance:
- Copper has relatively good resistance to oxidation and corrosion. While exposure to air can lead to a thin layer of oxide formation on the surface, it does not significantly affect the electrical conductivity of copper. Graphite, however, is prone to oxidation and can degrade over time when exposed to oxygen, increasing its resistance.
5. Lower Cost:
- Copper is a relatively affordable and abundantly available material compared to graphite. This cost advantage further supports its widespread use in electrical wiring.
While graphite has excellent conductivity properties, its practical limitations, higher resistivity, brittleness, and susceptibility to oxidation make it less suitable for general electrical wiring applications compared to copper.
