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Le capteur est branché au boîtier.

Le capteur est branché au boîtier.
The sensor is plugged into the control box.
From Lesson 298:In case of (en cas de)·French

Questions & Answers about Le capteur est branché au boîtier.

Why do we use au (à + le) here instead of dans le for 'into'?
In French, the verb brancher (to plug in or connect) is usually followed by the preposition à or sur to indicate what you are connecting the device to, rather than dans (in or into). So 'plugged into the control box' naturally becomes branché au boîtier.
Does est branché describe an action happening right now, or a state?
It describes a state. The past participle branché acts like an adjective here, showing the sensor is currently in a plugged-in state. If you wanted to emphasize the action of someone plugging it in right now, it is more natural to use the active voice in French, such as On branche le capteur (Someone is plugging in the sensor).
What exactly is a boîtier?
A boîtier is a small, rigid box or casing, usually designed to protect electronic or mechanical components. It comes from the everyday word boîte (box). In technical contexts, it often refers to a control box, a battery pack, or the housing of a device.
How can I easily remember the word capteur (sensor)?
Capteur comes from the verb capter, which means to capture, pick up, or receive (such as a Wi-Fi signal or a radio frequency). Therefore, a capteur is literally a device that 'picks up' physical data from its surroundings.

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