Jännitelakiin

Jännitelakiin, more commonly known as Ohm's Law, is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It was first formulated by the German physicist Georg Ohm in the 19th century. The law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature remain constant.

Mathematically, Ohm's Law is expressed as V = I * R, where V represents the voltage (measured in volts), I represents the current (measured in amperes), and R represents the resistance (measured in ohms). This equation can be rearranged to solve for current (I = V / R) or resistance (R = V / I). Understanding these relationships is crucial for analyzing and designing electrical circuits.

The law applies primarily to ohmic conductors, which exhibit a linear relationship between voltage and current. However, many components, such as diodes and transistors, are non-ohmic and do not strictly follow Ohm's Law. Despite these limitations, Ohm's Law remains an indispensable tool for understanding basic electrical behavior and is a cornerstone of electrical education and practice.