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The resistivity of a material is a measure of how strongly a material opposes the flow of electrical current. The symbol for resistivity is the lowercase Greek letter rho, ρ, and resistivity is the reciprocal of electrical conductivity: (9.4.3)ρ =. The unit of resistivity in SI units is the ohm-meter (Ω ⋅ m.
Learn the key terms, equations, and skills related to current, resistance, and resistivity, and how to find the current direction. See examples, diagrams, and tips on how to visualize and understand these concepts.
Learn what resistance is and how to calculate it using the formula R = V/I. Find out the unit of resistance, the inverse of conductance, and the derivation of the formula from Ohm's law. See solved examples on resistance formula.
Learn how to calculate the electrical resistance of a circuit component or device using Ohm's law and the resistivity of the material. Explore the factors that affect the resistance, such as temperature, geometry and resistor combinations.
Learn how to calculate the resistivity and resistance of a material based on its atomic structure and geometry. Find the formula for resistivity and examples of how to apply it to different situations.
OpenStax. Learning Objectives. By the end of this section, you will be able to: Explain the origin of Ohm’s law. Calculate voltages, currents, or resistances with Ohm’s law. Explain what an ohmic material is. Describe a simple circuit. What drives current?
R = ρ (l/A) where l is the length of the conductor and A is its cross-sectional area. This equation shows that the resistance of a conductor increases with length and decreases with increasing cross-sectional area, while the resistivity of the material remains constant.
