How is resistivity quantified?

• A. Ohm per meter
• B. Volt per ampere
• C. Kelvin per kilogram
• D. Joule per second

Answer: (A)

Resistivity is quantified in ohm per meter, which reflects the ability of a material to resist the flow of electric current. The unit of resistivity is derived from the resistive property of a material and is expressed in ohms (Ω), indicating resistance, per meter (m), indicating the length of the conductor.

In practical terms, resistivity helps to characterize how much resistance material will present in relation to its length and cross-sectional area. It is a fundamental property of materials and is crucial when designing electrical systems, allowing engineers to predict how materials will behave under electrical loads. This quantification assists in selecting appropriate materials for various electrical applications, as different materials have different resistivities.

The other options relate to various physical quantities but do not provide a measure for resistivity. For example, volt per ampere measures electrical resistance (Ohm), Kelvin per kilogram relates to temperature changes in thermodynamics, and Joule per second represents power. These are critical concepts but are distinctly different from resistivity.