See <<acoustic resistance>>

1. The opposition that a device or material offers to the flow of direct current, equal to the voltage drop across the element divided by the current through the element. Also known as electrical resistance.

2. In an alternating-current circuit, the real part of the complex impedance.

See <<fluid resistance>>

In damped harmonic motion, the ratio of the frictional resistive force to the speed. Also known as damping coefficient; damping constant; mechanical resistance.