How to Say "power supply" in Spanish
The Spanish word for “power supply” is “alimentación” — B2 level.
English → SpanishB2
nounB2
electrical input for a device

Examples
Corta la alimentación eléctrica antes de reparar el cable.
Cut the power supply before repairing the cable.
El problema está en la alimentación de combustible del motor.
The problem is in the engine's fuel feed.
La máquina se detuvo por falta de alimentación de papel.
The machine stopped due to a lack of paper feed.
Technical Usage
In technical Spanish, this word describes how energy or materials enter a system. Think of the machine being 'fed' power.
Mixing up 'power' words
Mistake: “El ordenador no tiene energía eléctrica.”
Correction: El ordenador no tiene alimentación (or) No llega corriente.
Related Translations
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