Elektronska oprema je na sakupljačkom mestu.

In Serbian, oprema is a singular mass/collective noun, much like equipment in English.

So:

• oprema = equipment
• grammatically it is singular
• that is why the verb is je (is), not su (are)

Even if the equipment consists of many objects, Serbian still treats oprema as one whole category.

Because the subject is elektronska oprema, and the head noun there is oprema, which is singular feminine.

So the sentence agrees like this:

• oprema → singular
• je → 3rd person singular of biti (to be)

If the subject were a true plural noun, then you would use su.

It is in the locative case.

The preposition na can take:

• locative when it means location / being somewhere
• accusative when it means movement toward a place

Here the sentence describes a location, not movement, so Serbian uses na + locative:

• na sakupljačkom mestu = at the collection point/site

Compare:

• Oprema je na sakupljačkom mestu. = The equipment is at the collection point.
• Stavljam opremu na sakupljačko mesto. = I am putting the equipment onto/to the collection point.

That is mostly a matter of Serbian usage.

Both na and u can sometimes translate as in/at, but Serbian chooses one depending on the type of place and idiomatic usage.

With mesto in the sense of a designated point, site, or spot, na is very natural:

• na sakupljačkom mestu = at the collection point/site

Using u would suggest more strongly being inside something, which does not fit as well here.

So for this phrase, na is the normal choice.

Because the phrase is in the locative singular, and both the adjective and the noun have to change form.

Dictionary forms:

• sakupljačko = neuter singular nominative
• mesto = neuter singular nominative

Locative singular:

• sakupljačkom
• mestu

So:

• nominative: sakupljačko mesto
• locative after na: na sakupljačkom mestu

This is adjective-noun agreement in action.

The dictionary form is sakupljački.

It is an adjective related to sakupljati (to collect, gather).
So sakupljačko mesto literally means something like:

• collecting place
• collection point
• collection site

In the sentence, it appears as sakupljačkom because it must match mestu in:

• gender: neuter
• number: singular
• case: locative

Mesto is a neuter noun.

That matters because the adjective must agree with it. So the adjective sakupljački changes to match a neuter singular noun in the needed case.

Here is the agreement:

• nominative: sakupljačko mesto
• locative: na sakupljačkom mestu

So the form of the adjective is not random; it is determined by mesto.

Because oprema is feminine singular nominative, and the adjective must agree with it.

Dictionary form of the adjective:

• masculine: elektronski
• feminine: elektronska
• neuter: elektronsko

Since oprema is feminine singular:

• elektronska oprema

This is the normal Serbian agreement pattern for adjectives.

Yes. Serbian word order is more flexible than English word order.

The given sentence:

• Elektronska oprema je na sakupljačkom mestu.

is a neutral, straightforward order.

You could also say:

• Na sakupljačkom mestu je elektronska oprema.

That version puts more focus on the location.

The meaning stays basically the same, but the emphasis changes.

In the present tense, yes, if you are making a normal statement like this.

Serbian sometimes omits forms of to be in certain styles or short labels, but in a full standard sentence:

• Elektronska oprema je na sakupljačkom mestu.

the je should be there.

Without it, the sentence would sound incomplete in ordinary standard usage.

A few sounds may stand out to an English speaker:

• lj in sakupljačkom is a single Serbian sound, similar to the lli in million for many English speakers.
• č is like ch in church, but usually a bit firmer.
• j is pronounced like English y in yes.

A rough pronunciation guide for the word is:

sa-KOO-plya-chkom

Not perfect, but close enough to help at first.

It is a very natural phrase for a collection point/site.

Serbian often forms practical location phrases like this:

• adjective describing the function
• • mesto (place/site/spot)

So sakupljačko mesto is not strange or unusual; it is a normal way to name a designated place for collecting something.