English to Serbian Tech/Engineering Electronics / Elect Eng Computer power supply

A power supply rail or voltage rail refers to a single voltage provided by a power supply unit (PSU). Although the term is generally used in electronic engineering, many people, especially computer enthusiasts, encounter it in the context of personal computer power supplies.
https://en.wikipedia.org/wiki/Power_supply_unit_(computer)

The PSU normally supplies +3.3 V, +5 V, and +12 V to the system. These voltages are often called rails, referring to the fact that although there are multiple wires carrying a specific voltage, they are normally tied to a single rail (or tap) in the PSU.
http://www.tomshardware.co.uk/power-supply-specifications-at...