Tabela de resistividade metálica e coeficiente de temperatura

Table of metallic resistivity and temperature coefficient

Table of metallic resistivity and temperature coefficient

The metallic resistivity and temperature coefficient table is a fundamental tool in engineering and physics, as it offers crucial information about how different metallic materials conduct electricity and how their resistance varies with temperature. This data is essential for the design of electronic devices, heating systems and other industrial applications where precision in electrical conduction and thermal behavior is required.

Understanding Metallic Resistivity

Resistivity is an intrinsic property that measures the opposition that a material offers to the flow of electrical current. It is influenced by the chemical composition of the metal, its crystalline structure and the temperature to which it is subjected. Metals such as copper and silver have very low resistivities, making them ideal for use in electrical conduction applications such as wires and cables. On the other hand, materials such as nickel and tungsten have greater resistivity, making them useful in applications such as heating elements.

Temperature Coefficient of Resistance

The temperature coefficient of resistance indicates how the resistivity of a material changes with temperature. Generally, for pure metals, resistivity increases with increasing temperature, which is described by the positive temperature coefficient. This behavior can be explained by the fact that, as the temperature increases, the atoms in the metal vibrate more intensely, making it difficult for electrons to pass through, which increases the material's resistance. On the other hand, in some semiconductor materials and in specific situations, a negative coefficient can be observed, where the resistivity decreases with increasing temperature.

These parameters are essential for engineers and designers working with electronic and thermal applications, as they allow them to adjust specifications and guarantee the efficiency and safety of the products and systems developed. Understanding these properties helps in the appropriate choice of materials for each application, taking into account operating conditions and performance requirements.

Table of metallic resistivity and temperature coefficient

Materials Temperature
t/℃		 Electrical resistivity
p /×10 -8 Ω·m		 Temperature coefficient of resistance
at R /℃ -1
Silver 20 1,586 0.0038(20°C)
Copper 20 1,678 0.00393(20°C)
Gold 20 2:40 am 0.00324(20°C)
Aluminum 20 2.6548 0.00429(20°C)
Calcium 0 3.91 0.00416(0°C)
Beryllium 20 4.0 0.025(20°C)
Magnesium 20 4.45 0.0165(20°C)
Molybdenum 0 5.2
Iridium 20 5.3 0.003925(0℃~100℃)
Tungsten 27 5.65
Zinc 20 5,196 0.00419(0℃~100℃)
Cobalt 20 6.64 0.00604(0℃~100℃)
Nickel 20 6.84 0.0069(0℃~100℃)
Cadmium 0 6.83 0.0042(0℃~100℃)
Indian 20 8.37
Iron 20 9.71 0.00651(20°C)
Platinum 20 10.6 0.00374(0℃~60℃)
Tin 0 11.0 0.0047(0℃~100℃)
Rubidium 20 12.5
Chrome 0 12.9 0.003(0℃~100℃)
Gallium 20 17.4
Thallium 0 18.0
Cesium 20 20
Lead 20 20,684 (0.0037620°C~40°C)
Antimony 0 39.0
Titanium 20 42.0
Mercury 50 98.4
Manganese 23~100 185.0

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