# Ohm's law

## Definitions

### General Science

### Construction

- 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).

### Electronics

- 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

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