tulovirran

Tulovirran is a Finnish term used in technical contexts to denote the current that flows into a system, device, or circuit from a power source. The form tulovirran is the genitive of tulovirta, reflecting its role as the possessive or modifying element in phrases such as tulovirran vaihtelu (variation of the input current) or tulovirran suuruus (magnitude of the input current). The exact meaning depends on the field and the surrounding terminology.

Linguistically, the word is built from tul- (a stem related to entering or incoming) and virta (current or flow). In Finnish compound language, tulovirta functions as a specialized noun describing an incoming electrical quantity rather than a general concept of current.

In electrical engineering and electronics, tulovirran is commonly used to refer to the current drawn by a component or subsystem from its supply. It is often discussed alongside related quantities such as input impedance, output current, and supply voltage. Because Finnish terminology varies by author and subfield, tulovirran may be found alongside synonyms like syöttövirta, which also means input current in many technical texts.

See also: virta, tulovirta-suhde, syöttövirta, sähkötekniikka.