Question 1

Why is it d'effraction and not d'une effraction?

Accepted Answer

The phrase en cas de is usually followed directly by a noun without an article (like un, une, or la) when referring to a general concept or event. So, 'in case of a break-in' is simply en cas d'effraction. You drop the article unless you are talking about a very specific, previously mentioned event.

Question 2

Could I rephrase this sentence using si (if)?

Accepted Answer

Yes! En cas de followed by a noun is just a concise, slightly more formal way to set a condition. You could express the exact same idea with a full clause: S'il y a une effraction, le capteur alerte la police (If there is a break-in, the sensor alerts the police).

Question 3

Is effraction the usual French word for 'robbery'?

Accepted Answer

Not quite. Une effraction specifically means a 'break-in' or 'forced entry' (like smashing a window or breaking a lock). A theft or robbery in general is un vol. A burglary is often referred to as un vol avec effraction (theft with forced entry).

Question 4

How does the word capteur translate to 'sensor'?

Accepted Answer

It comes from the verb capter, which means 'to pick up' (like a Wi-Fi signal), 'to capture,' or 'to detect.' Therefore, un capteur is literally a device that picks up or detects changes in its environment, which is exactly what a sensor does.

En cas d'effraction, le capteur alerte la police.

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