NCEA Level 2 Electricity Practice Exam 2025 – Complete Study Resource

Ohm's Law is fundamental to understanding the relationships between voltage, current, and resistance in an electrical circuit. This law states 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. Essentially, it is expressed with the formula \( V = I \times R \), where \( V \) is voltage, \( I \) is current, and \( R \) is resistance.

Using Ohm's Law allows for the calculation of any one of these three quantities if the other two are known. This capability makes it an essential tool for circuit analysis, enabling engineers and technicians to design and troubleshoot electrical systems effectively. Understanding how changes in resistance affect current flow and voltage levels is imperative for ensuring circuits operate safely and efficiently.

The other choices do not accurately represent the role of Ohm's Law. While it does not predict future trends, determine costs, or provide behavioral insights, its primary utility lies in the direct calculation of voltage, current, and resistance in circuits, which is vital for practical circuit design and problem-solving.