The square of the magnitude of the impedance is equal to the sum of the squares of reactance and this other quantity.
When this property is highly dependent on temperature, it can be calculated using the Steinhart-Hart equation. Extremely small values of this quantity can be measured by a Kelvin double bridge, which uses four-terminal sensing. The product of this quantity and capacitance gives a circuit's time constant. The square of the magnitude of the impedance is equal to the sum of the squares of reactance and this other quantity. For a wire, this property is proportional to path length over area. Ohm's law states that this quantity equals voltage drop over current. For 10 points, name this quantity, which represents the opposition to current flow in a circuit and is measured in ohms.
When this property is highly dependent on temperature, it can be calculated using the Steinhart-Hart equation.
electrical resistance [prompt on R]