What are the units of electrical resistance?

• A. Volts
• B. Amperes
• C. Watts
• D. Ohms

Answer: (D)

The units of electrical resistance are expressed in ohms. This unit of measurement is named after Georg Simon Ohm, a German physicist who formulated Ohm's Law, which describes the relationship between voltage, current, and resistance in an electrical circuit. According to Ohm's Law, resistance (R) is calculated as the ratio of voltage (V) across a component to the current (I) flowing through it, represented by the formula R = V/I.

Understanding ohms as the unit of electrical resistance is crucial for evaluating and designing circuits, as resistance affects how much current will flow for a given voltage. In practical terms, knowing the resistance of different materials or components helps in selecting the right ones for a specific application, whether in electronics, telecommunications, or other fields of technology.