What is the mathematical expression for Ohm's law?

• A. V = IR
• B. I = VR
• C. R = IV
• D. P = RI

Answer: (A)

Ohm's law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It establishes that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Mathematically, this relationship is succinctly expressed as V = IR, where V is the voltage in volts, I is the current in amperes, and R is the resistance in ohms.

This fundamental principle is crucial in circuit analysis and design because it allows engineers to calculate how much current will flow for a given voltage and resistance, or vice versa. Understanding Ohm's law is essential for solving complex circuit problems and designing effective electrical systems.