Електрик знеструмив квартиру.

Because квартиру is in the accusative singular, which is the case used for a direct object.

• квартира = nominative singular, the dictionary form
• квартиру = accusative singular

In this sentence, the apartment is the thing affected by the action, so Ukrainian uses the accusative:

• Електрик = the subject
• знеструмив = did the action
• квартиру = received the action

For many feminine nouns ending in -а, the accusative singular changes -а to -у:

• машина → машину
• кімната → кімнату
• квартира → квартиру

Знеструмив is a past tense verb form, specifically:

• perfective
• masculine singular
• from the infinitive знеструмити

So it means a completed action in the past: the power was cut off / the apartment was de-energized.

The masculine singular form matches the subject електрик, which is a masculine singular noun.

Yes. In Ukrainian, past tense verbs agree with the subject in gender and number.

Here:

• електрик is masculine singular
• so the verb is знеструмив

Compare:

• Електрик знеструмив квартиру. = male electrician
• Електрикиня знеструмила квартиру. = female electrician
• Електрики знеструмили квартиру. = electricians

This is different from English, where the past tense verb usually does not change for gender.

Because Ukrainian often uses the verb знеструмити directly with the place or object that loses power.

So знеструмити квартиру literally means something like to deprive the apartment of electric current.

That is why квартиру can be the direct object. English often prefers a longer expression such as:

• cut off power to the apartment
• disconnect the apartment from the power supply

Ukrainian can express that idea more compactly with one verb.

Yes, знеструмив is perfective, so it presents the action as completed.

The usual imperfective partner is знеструмлювати.

Compare:

• Електрик знеструмив квартиру. = The electrician cut off the power to the apartment.
  Completed, one whole event.

• Електрик знеструмлював квартиру. = The electrician was cutting off the power to the apartment / used to cut off the power to the apartment.
  Ongoing, repeated, or process-focused.

This is a very common Ukrainian contrast.

Yes. That can be very helpful.

A simplified breakdown is:

• зне- = a prefix that often gives the sense of removing, depriving, or undoing
• струм = electric current
• -ити = verb ending in the infinitive знеструмити
• -в = past masculine singular ending in знеструмив

So the verb is built around the idea of removing current.

That makes the meaning easier to remember than treating it as one completely opaque word.

Because електрик is the subject of the sentence, so it is in the nominative singular.

This is also the dictionary form of the noun:

• електрик = electrician

So the basic sentence pattern here is:

• Електрик — subject, nominative
• знеструмив — verb
• квартиру — direct object, accusative

Because Ukrainian has no articles.

So електрик can mean:

• an electrician
• the electrician

And квартиру can mean:

• an apartment
• the apartment

The exact meaning depends on context, not on a separate word like a or the.

English speakers often look for an article, but in Ukrainian you usually infer definiteness from:

• context
• word order
• what has already been mentioned
• what is obvious in the situation

No, Ukrainian word order is fairly flexible.

Електрик знеструмив квартиру is the most neutral order here:
subject + verb + object

But other orders are possible, with different emphasis:

• Квартиру знеструмив електрик.
  Puts more focus on квартиру or on who did it

• Знеструмив квартиру електрик.
  More marked; can sound literary or strongly focused

So the original sentence is the most straightforward, textbook-style way to say it.

A rough Latin transliteration is:

Elektryk znestrumyv kvartyru.

A few pronunciation tips:

• и is not English ee; it is a shorter, more central vowel
• р is usually tapped or lightly rolled
• кв in квартиру is pronounced together, like kv
• Ukrainian pronunciation is generally closer to spelling than English pronunciation is

If you want to sound natural, one of the most useful things to practice here is the vowel и, since it appears in all three words:

• електрик
• знеструмив
• квартиру