What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that states the relationship between voltage, current, and resistance in an electrical circuit. It is expressed by the formula V = IR, where V represents voltage (in volts), I represents current (in amperes), and R represents resistance (in ohms). This equation illustrates 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 within the circuit.

Understanding Ohm's Law is essential for analyzing electrical circuits, enabling electricians and engineers to calculate the necessary voltage or resistance for a desired current flow. This principle lays the groundwork for much of electrical theory and practice, including circuit design, diagnostics, and troubleshooting, making it a foundational concept for anyone working in electrical fields.

Other options refer to related but distinct concepts; while measuring electrical resistance is part of Ohm's Law applications, it alone does not define the law itself. Guidelines for electrical safety are critical for preventing accidents but aren't encompassed within Ohm's Law. Likewise, while alternating current does have principles related to circuit behavior, Ohm's Law is broadly applicable to both direct and alternating current circuits, making the specific application to alternating current misleading.