What is the primary unit of electrical resistance?

What is the primary unit of electrical resistance?

• A. Volt
• B. Ampere
• C. Ohm
• D. Farad

Answer: (C)

The primary unit of electrical resistance is the Ohm. This unit is defined as the amount of resistance that allows one ampere of current to flow when one volt of electrical potential is applied. The relationship between voltage (V), current (I), and resistance (R) is expressed by Ohm's Law, which states that V = I × R. Thus, understanding Ohm as the unit of resistance is crucial for evaluating and analyzing electrical circuits, as it helps in measuring how much a material opposes the flow of electric current.

The other choices represent different electrical concepts. Volt is the unit of electrical potential, Ampere is the unit of electrical current, and Farad is the unit of capacitance. Each of these units plays a distinct role in electrical systems, but in the context of resistance, the Ohm is the relevant unit to consider.