Ako osigurač ne radi, ne možemo upaliti svjetlo u kuhinji.

In this sentence, osigurač is the electrical safety device in a home circuit. Depending on context, it can mean either:

• fuse
• circuit breaker

In everyday speech, Croatian speakers may use osigurač for either one unless they need to be technically precise.

Yes, ako means if and introduces a condition:

• Ako osigurač ne radi = If the fuse/circuit breaker isn’t working

It is the normal word for real, possible conditions. It is very common and straightforward.

Croatian often uses the present tense in both parts of a real condition, just like English can:

• Ako osigurač ne radi, ne možemo upaliti svjetlo.
• If the fuse doesn’t work, we can’t turn on the light.

This structure is used for:

• general truths
• normal real-life situations
• likely conditions

So there is nothing unusual here.

Raditi can mean to work in more than one sense. It can mean:

• to do work / have a job
• to function / to be working

Here it means to function:

• Osigurač radi. = The fuse is working.
• Osigurač ne radi. = The fuse isn’t working.

Croatian uses raditi for machines, devices, and systems very often.

In Croatian, ne is normally written separately from verbs:

• ne radi
• ne možemo
• ne znam
• ne vidim

So this is the standard spelling pattern for negative verbs.

A few forms are exceptions in Croatian, but in this sentence everything follows the normal rule.

After moći (can / to be able to), Croatian uses the infinitive:

• mogu doći = I can come
• možemo upaliti = we can turn on

So:

• možemo = we can
• upaliti = infinitive, to turn on

Using a present-tense form like upalimo after možemo would be incorrect here.

This is a very important aspect question.

• paliti = imperfective
• upaliti = perfective

In this sentence, the meaning is a single completed action: to switch on / turn on the light. Because of that, Croatian naturally uses the perfective verb upaliti.

So:

• upaliti svjetlo = to turn the light on
• paliti svjetlo can suggest repeated action, process, or habitual action, depending on context

After moći, both aspects are possible in Croatian, but here upaliti is the natural choice because it refers to one specific act.

Literally, upaliti is related to lighting/igniting/turning on, but in everyday Croatian:

• upaliti svjetlo = turn on the light
• ugasiti svjetlo = turn off the light

So even though the literal image may sound like ignite, the normal idiomatic translation is turn on.

Croatian also uses upaliti for other things:

• upaliti TV = turn on the TV
• upaliti auto = start the car
• upaliti računalo = turn on the computer

Svjetlo is the direct object of upaliti, so it is in the accusative case.

The noun svjetlo is neuter singular, and for many neuter nouns:

• nominative singular = accusative singular

So the form stays the same:

• nominative: svjetlo
• accusative: svjetlo

That is why you do not see any ending change here.

Because this phrase shows location, not movement.

With u:

• u + accusative = motion into somewhere
• u + locative = being in somewhere

Here the light is located in the kitchen, so Croatian uses the locative:

• u kuhinji = in the kitchen

Compare:

• Idem u kuhinju. = I’m going into the kitchen.
• Ja sam u kuhinji. = I am in the kitchen.

Because Ako osigurač ne radi is a subordinate if-clause, and Croatian normally separates it from the main clause with a comma:

• Ako osigurač ne radi, ne možemo upaliti svjetlo u kuhinji.

This is standard punctuation.

You will also see the comma when the main clause comes first:

• Ne možemo upaliti svjetlo u kuhinji ako osigurač ne radi.

Yes, Croatian word order is fairly flexible, although some versions sound more neutral than others.

The given sentence is the most neutral:

• Ako osigurač ne radi, ne možemo upaliti svjetlo u kuhinji.

You could also say:

• Ne možemo upaliti svjetlo u kuhinji ako osigurač ne radi.

This has the same basic meaning, but the focus feels slightly different because the main clause comes first.

Croatian often changes word order for:

• emphasis
• rhythm
• information structure

But for a learner, the original order is a very good standard model.

In this sentence, svjetlo most naturally means the light in the sense of the room light being on or off.

So:

• upaliti svjetlo u kuhinji = turn on the kitchen light

It does not have to refer to the lamp as a physical object. It usually refers to the light source/system as used in everyday speech.

Yes. Both can work.

• upaliti svjetlo = very common, natural, everyday
• uključiti svjetlo = also correct, a bit more like switch on

For lights, upaliti is probably the most idiomatic everyday choice.

So the sentence could also be:

• Ako osigurač ne radi, ne možemo uključiti svjetlo u kuhinji.

But the original version sounds very natural.

Možemo is:

• 1st person plural
• present tense
• from moći = can / to be able to

So it means:

• we can
• in the negative: ne možemo = we cannot / we can’t

This tells us that the speaker includes themself in the group.