- A scientific law stating that the current in an electrical circuit is directly proportional to the voltage and inversely proportional to the resistance. Stated as an equation: I (current) E (voltage)/R (resistance).
- A law stating that the current the flowing through a DC circuit is directly proportional to the voltage, and inversely proportional to the resistance. It may be expressed as follows: I = E/R, where I is the current, E is the voltage, and R is the resistance. For an AC circuit, the relationship would be: I = E/X, where I is the current, E is the voltage, and X is the impedance. When a conductor or material obeys this law, it is said to be ohmic. Ohm's law does not apply to all conductors of electricity