What unit measures electrical resistance in a circuit?

The unit that measures electrical resistance in a circuit is Ohms. Resistance is a fundamental property in electrical circuits that describes how much a material opposes the flow of electric current. The higher the resistance, the less current will flow for a given voltage according to Ohm's Law, which states that voltage equals current multiplied by resistance (V = I x R).

Understanding Ohms is crucial for anyone working in electrical fields, as it helps in calculating the correct values for components in a circuit to ensure safety and efficiency. Amperes measure the flow of current, Volts measure the electrical potential difference, and Watt-hours measure energy consumption, but none of these measure resistance directly. Thus, Ohms is specifically designed for that purpose and is an essential concept in electrical engineering and circuit design.