El detector de humo identifica un riesgo doméstico.

Detector is a masculine noun in Spanish, so it takes el in the singular: el detector.

A few useful points:

• Nouns ending in -or are very often masculine:
  
  • el motor
  • el color
  • el detector
• In Spanish, you normally use an article much more often than in English, so el detector sounds natural, whereas bare detector would usually need a special context, like a label or heading.

Also, detectora could exist in other contexts as a feminine form meaning female detector/discoverer, but not for the device here. For the machine, the standard word is el detector.

Spanish often uses noun + de + noun where English uses a compound noun.

So:

• detector de humo = literally detector of smoke
• English prefers smoke detector

This is extremely common in Spanish:

• taza de café = cup of coffee
• cepillo de dientes = toothbrush
• gafas de sol = sunglasses

So de humo tells you what kind of detector it is.

Because humo here is being used in a general, descriptive sense, not referring to some specific smoke.

• detector de humo = smoke detector / a detector for smoke in general

You would only use del (de + el) if you meant of the smoke, referring to a specific smoke already mentioned:

• el origen del humo = the source of the smoke

But in detector de humo, the phrase is just naming the type of device, so de humo is correct.

Identifica is the third-person singular present tense of identificar.

That means it matches el detector:

• yo identifico = I identify
• tú identificas = you identify
• él/ella identifica = he/she identifies
• el detector identifica = the detector identifies

So the verb agrees with the singular subject el detector.

Both verbs are possible in Spanish, but they are not always used in exactly the same way.

• detectar often means to detect, to pick up, to notice the presence of
• identificar often means to identify, to recognize, to determine what something is

So:

• El detector detecta humo = the detector detects smoke
• El detector identifica un riesgo doméstico = the detector identifies a household risk

In your sentence, identifica suggests that the detector is recognizing or indicating that something counts as a risk. It is slightly more analytical than just detecta.

Spanish usually needs an article with singular countable nouns when you mean a/an.

So:

• un riesgo doméstico = a household risk

Leaving out un would usually sound incomplete in a normal sentence.

Compare:

• Eso es un problema. = That is a problem.
• Tiene un defecto. = It has a flaw.
• Identifica un riesgo doméstico. = It identifies a household risk.

Spanish does sometimes omit articles in headlines, labels, or very compressed styles, but not in a standard sentence like this one.

Because doméstico is describing riesgo, and riesgo is a masculine singular noun.

Adjectives in Spanish usually agree with the noun they describe in gender and number:

• un riesgo doméstico
• una situación doméstica
• unos riesgos domésticos
• unas tareas domésticas

So the adjective changes to match the noun.

It is very close, but learners should be careful because English domestic has several meanings.

In this sentence, doméstico means something like:

• household
• in the home
• relating to the home

So riesgo doméstico means a household risk or risk in the home.

Spanish doméstico often refers to the home more directly than English domestic, which can sometimes sound more formal or broader.

Related examples:

• accidente doméstico = household accident / accident at home
• tareas domésticas = household chores
• animales domésticos = domestic animals / pets

Yes. Both are possible, but the meaning or focus changes slightly.

• El detector de humo identifica un riesgo doméstico.
  This usually sounds like you are talking about the smoke detector in a general or specific sense, depending on context.

• Un detector de humo identifica un riesgo doméstico.
  This sounds more like a smoke detector identifies a household risk, perhaps introducing the device as one example.

In Spanish, word order here is very similar to English:

Subject + verb + object

• El detector de humo = subject
• identifica = verb
• un riesgo doméstico = object

Yes, el can mean the, but Spanish also uses the definite article in some cases where English might sound more general.

So depending on context, el detector de humo could mean:

• the smoke detector (a specific one)
• or sometimes something closer to the smoke detector as a type/device

Spanish is often more comfortable than English with using the definite article for general reference.

For example:

• El perro es un animal fiel. = The dog is a loyal animal / Dogs are loyal animals.

In your sentence, the exact nuance depends on context, but grammatically el is perfectly normal.

The accent mark shows where the stress goes: do-MÉS-ti-co.

Without the accent, Spanish stress rules would make you pronounce it differently. The written accent tells you the stressed syllable must be més.

This is useful because doméstico has four syllables:

• do
• més
• ti
• co

So the accent mark helps both pronunciation and spelling.

A careful Spain Spanish pronunciation would be approximately:

el de-TEC-tor de HU-mo i-den-ti-FI-ka un RIES-go do-MES-ti-ko

A few pronunciation notes:

• h in humo is silent
• c before a/o/u sounds like a hard k, so doméstico has a k sound
• g in riesgo is a hard g because it comes before o
• r in riesgo is a light tap, not an English-style r
• the stress falls on:
  • detecTOR
  • HUmo
  • identiFIca
  • RIESgo
  • doMÉStico

It is understandable and correct, but depending on context, Spanish speakers might also use other phrases such as:

• un peligro doméstico = a household danger
• un riesgo en el hogar = a risk in the home
• un riesgo para el hogar = a risk for the home

The difference is slight:

• riesgo often sounds a bit more neutral or technical
• peligro often sounds more immediate or more obviously dangerous

So riesgo doméstico is fine, but in everyday usage you may also hear other options.

Yes. Grammatically, the sentence allows that reading.

Because it says:

• detector de humo = smoke detector
• identifica un riesgo doméstico = identifies a household risk

This suggests more than simply sensing smoke; it suggests the device is recognizing that something in the home is risky. In real life, whether that is natural depends on context, but the grammar supports that interpretation.

If you wanted a more literal, basic function, Spanish might say:

• El detector de humo detecta humo.
• El detector de humo avisa de un peligro.
• El detector de humo alerta de un riesgo doméstico.

So your sentence is grammatically fine, but slightly more conceptual than the most basic description of a smoke detector.