Resistance

Definition

Resistance is a measure of how much a material or device opposes the flow of electric current. It is determined by the material's properties and geometry, and it is measured in ohms.

Related terms

Ohmic Device: An ohmic device is one that follows Ohm's Law, meaning its resistance remains constant regardless of the applied voltage.

Non-Ohmic Device: A non-ohmic device does not follow Ohm's Law and its resistance changes with the applied voltage.

Conductivity: Conductivity refers to how easily a material allows electric current to pass through it. It is the reciprocal of resistance and is measured in siemens per meter (S/m).