What is the unit of measurement for electrical resistance?

• A. Volt (V)
• B. Watt (W)
• C. Ohm (Ω)
• D. Ampere (A)

Answer: (C)

The unit of measurement for electrical resistance is the ohm (Ω). This unit is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which relates voltage, current, and resistance in an electrical circuit. According to Ohm's Law, the resistance (R) in a circuit is defined as the voltage (V) across the circuit divided by the current (I) flowing through it, mathematically expressed as R = V/I.

Understanding resistance is crucial because it provides insights into how much a material opposes the flow of electric current. High resistance indicates that less current will flow for a given voltage, which is crucial in circuit design and analysis. In contrast, the other options represent different electrical concepts: voltage is measured in volts, power in watts, and current in amperes. Each of these plays a distinct role in the study of electricity but does not represent the specific measurement of resistance.