what is ohms law in physics

Ohms Law is a fundamental law of physics that describes the relationship between electric current, voltage, and resistance in an electrical circuit. It states that the current flowing through a conductor is directly proportional to the voltage applied to it, provided all physical conditions and temperatures remain constant. Mathematically, Ohms Law can be expressed as V = IR, where V is voltage, I is current, and R is resistance. This equation can be rearranged to solve for any of the three variables, depending on which two are known. Ohms Law is especially useful when resistance needs to be calculated, as it cannot be measured in an operating circuit. Instead of shutting off the circuit to measure resistance, a technician can determine resistance using the above variation of Ohms Law. Ohms Law is applicable to both metal conductors and circuit components (resistors) specifically made for this behavior.