How does Ohm's Law relate to electrical circuits?

• A. It defines the relationship between power and voltage
• B. It establishes the relationship between voltage, current, and resistance (V = IR)
• C. It calculates the total current in a circuit
• D. It identifies the efficiency of a circuit

Answer: (B)

Ohm's Law is a fundamental principle in electrical engineering that articulates the relationship among voltage, current, and resistance in a circuit. It is succinctly expressed by the equation V = IR, where V represents voltage, I represents current, and R indicates resistance. This relationship is essential because it allows for the analysis and design of electrical circuits by providing a clear mathematical framework to understand how changes in one variable affect the others.

For instance, if the resistance in a circuit increases while the voltage remains constant, Ohm's Law shows that the current must decrease. This relationship is crucial for troubleshooting, designing circuits, and predicting how an electrical system will behave under different conditions. Understanding Ohm’s Law is foundational for anyone working with electrical systems, as it governs the behavior of all resistive components within circuits.