Nate Electrical Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Electrical resistance is measured in ohms, which is a fundamental unit in the field of electrical engineering. The resistance of a conductor defines how much it opposes the flow of electric current. When a voltage is applied across a conductor, the resistance determines how much current will flow according to Ohm's Law, which is expressed as V = I × R, where V represents voltage, I represents current in amperes, and R represents resistance in ohms.

Understanding resistance in ohms allows engineers and electricians to design circuits effectively, ensuring that they can manage and predict the behavior of electrical systems under various conditions. This measurement is crucial for ensuring safety and efficiency in electrical installations. The other units, including amperes (which measure current), volts (which measure electrical potential), and watts (which measure power), serve different roles in electrical systems but do not measure resistance.