Vekselstrømmen brukes hjemme.

Because -en makes the noun definite.

• vekselstrøm = alternating current / AC in a general sense
• vekselstrømmen = the alternating current

In Norwegian, the definite article is usually added to the end of the noun instead of being a separate word like English the.

So:

• en vekselstrøm = an alternating current
• vekselstrømmen = the alternating current

In this sentence, Norwegian treats it as a definite thing: the alternating current is used at home.

Here, -en is the definite ending for a common-gender noun.

The noun is:

• en vekselstrøm = a common-gender noun

Its definite singular form is:

• vekselstrømmen = the alternating current

This is very common in Norwegian:

• en bil → bilen
• en stol → stolen
• en strøm → strømmen

So vekselstrømmen follows the same pattern.

Yes. Brukes is the s-passive form of bruke.

• å bruke = to use
• bruker = use / uses
• brukes = is used / are used

So:

• Vekselstrømmen brukes hjemme. = The alternating current is used at home.

Norwegian often forms the passive by adding -s to the verb. This is especially common in factual, general, or formal statements.

Because Norwegian can express the passive in two main ways:

1. s-passive

   • brukes = is used

2. bli

   • past participle
   • blir brukt = is used

So the sentence could also be:

• Vekselstrømmen blir brukt hjemme.

But brukes is shorter and very natural in general statements, technical writing, and neutral descriptions.

Both can mean is used, but they are not always identical in style.

• brukes: often sounds more neutral, factual, or formal
• blir brukt: often sounds a bit more verbal or dynamic, and can emphasize the action or process more

In a sentence like this, brukes is very natural because it sounds like a general fact:

• Vekselstrømmen brukes hjemme.

If you said:

• Vekselstrømmen blir brukt hjemme.

that is also correct, but it may sound slightly less compact and a bit less technical.

Because hjemme means at home, while hjem often means home as a destination.

Compare:

• Jeg er hjemme. = I am at home.
• Jeg drar hjem. = I am going home.

In your sentence, the meaning is location, not movement, so hjemme is the correct choice:

• Vekselstrømmen brukes hjemme. = Alternating current is used at home.

Because it is an adverb of place, and in a simple statement like this it commonly comes after the verb.

Structure here:

• Vekselstrømmen = subject
• brukes = verb
• hjemme = place adverb

This word order is very normal in Norwegian:

• Bilen står ute.
• Barna leker inne.
• Vekselstrømmen brukes hjemme.

You can move elements around for emphasis, but the basic order here is straightforward and natural.

Yes. Norwegian uses compound nouns very often.

Here:

• veksel = alternating / change-related
• strøm = current

Together:

• vekselstrøm = alternating current

And then the definite ending is added to the whole compound:

• vekselstrømmen

This is very typical in Norwegian. English often writes technical expressions as two words, but Norwegian frequently combines them into one.

It is a common-gender noun, which is why it takes:

• en in the indefinite singular
• -en in the definite singular

So:

• en vekselstrøm
• vekselstrømmen

Yes, gender matters because it affects articles and endings.

Yes, it is grammatical and natural, especially in a factual or technical context.

It sounds like a general statement, similar to something you might see in a textbook or explanation about electricity.

In everyday conversation, a Norwegian speaker might also say something more specific, depending on context, but the sentence itself is perfectly good Norwegian.

Yes, that is possible, but it sounds more formal and less everyday.

Compare:

• Vekselstrømmen brukes hjemme. = natural, general, everyday wording
• I hjemmet brukes vekselstrømmen. = more formal, more written, almost technical or official

Also, i hjemmet means more literally in the home / household, while hjemme simply means at home. For most ordinary situations, hjemme is the more natural choice.