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Resistance to electric flow through a circuit is measured in ohms. This unit is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which defines the relationship between voltage, current, and resistance. In this law, resistance (R) is the measure of how much a material opposes the flow of electric current (I) when a voltage (V) is applied across it.

The concept of resistance is crucial in understanding how electrical circuits function. Higher resistance means that it is more difficult for current to flow, while lower resistance allows for easier current flow. This principle has practical applications in numerous electrical devices and components, where controlling resistance is key to achieving desired electrical performance.

Other units mentioned relate to different electrical properties: volts measure electric potential, watts measure power (which is the product of voltage and current), and amperes quantify the flow of electric current itself. Thus, the concept of resistance is distinct and specifically denoted by ohms.