Electrical Engineering
Discovered in 1827, Ohm's Law (V = IR) applies to both direct current (DC) and alternating current (AC) circuits.
However, in AC circuits, the relationship becomes more complex due to the presence of reactance (inductive and capacitive components) in addition to resistance.
In AC circuits, the voltage and current are often represented as phasors, and Ohm's Law is expressed using impedance (Z) instead of resistance (R). The equation becomes:
V = IZ
... where (Z) is the impedance, which combines resistance (R) and reactance (X).
