sähköneristävyydestään

Sähköneristävyydestään is a Finnish term referring to electrical resistivity. It is a fundamental property of a material that quantifies how strongly it opposes the flow of electric current. High resistivity indicates that a material is a poor conductor of electricity, while low resistivity signifies it is a good conductor.

The unit of electrical resistivity is the ohm-meter (Ω⋅m). This value depends on the material's composition, temperature, and, in some cases, the presence of impurities or defects. For example, metals like copper and silver have very low resistivity, making them excellent conductors used in electrical wiring. Conversely, materials such as rubber, glass, and certain plastics exhibit very high resistivity, making them effective electrical insulators.

Electrical resistivity is the inverse of electrical conductivity. Conductivity measures how well a material conducts electricity. Therefore, a material with high resistivity has low conductivity, and vice versa. Understanding and measuring a material's resistivity is crucial in various engineering applications, from designing electrical circuits to selecting appropriate insulation for power transmission lines. Temperature significantly affects resistivity; for most conductors, resistivity increases with temperature. For semiconductors and insulators, the relationship can be more complex.