2026 CSRE National Practice Test – Complete Study Resource

An ohm measures the resistance a component offers to the flow of electric current. Resistance is how much a part slows down or limits current for a given voltage, summarized by V = IR. So the ohm is defined as the unit for that property: the amount of resistance that produces one ampere of current with one volt applied.

Capacitance (measured in farads) relates to storing charge, not resisting current. Current (measured in amperes) is the rate of charge flow, and power (measured in watts) is the rate of energy transfer. The ohm specifically quantifies opposition to current, making it the correct concept here.