KNOWN CURRENT in this very context???

[ksiushka]

How would you translate "known current" in this context? (Данный ток? определенный ток?)

If a known current is applied between the X connecting point and rod Z, a potential difference (voltage drop) will exist between the X connection and rod Y.
(No current has been mentioned in the previous text)

Thank you.

[Enote]

Ток известной величины