Hjertestarteren er klar.

Because Norwegian very often makes compound nouns by joining words together.

Here, hjertestarteren is built from:

• hjerte = heart
• starter = starter
• -en = the definite ending

So the basic noun is hjertestarter, and then -en is added to mean the hjertestarter.

This is very normal in Norwegian. Where English might write two words or use a phrase, Norwegian often prefers one long compound word.

The ending -en is the definite article attached to the noun. In English, that is usually the.

So:

• en hjertestarter = a defibrillator / a heart starter
• hjertestarteren = the defibrillator

This happens with many Norwegian nouns. Instead of putting the before the noun, Norwegian often adds the definiteness to the end.

Because hjertestarteren already includes the idea of the.

In a simple noun phrase, Norwegian usually does not add another definite word before it:

• hjertestarteren = the defibrillator

However, if there is an adjective, Norwegian often uses double definiteness:

• den klare hjertestarteren = the ready defibrillator

So in your sentence, a separate den is not needed.

Because klar has to agree with the noun in gender and number.

Hjertestarter is a common gender singular noun, so the adjective is:

• klar

Compare:

• bilen er klar = the car is ready
• huset er klart = the house is ready
• bilene er klare = the cars are ready

So:

• common gender singular → klar
• neuter singular → klart
• plural → klare

In this sentence, hjertestarteren is singular and common gender, so klar is correct.

No. Klar can have several meanings depending on context, such as:

• ready
• finished
• clear
• understandable
• sometimes bright or vivid

In Hjertestarteren er klar, it means something like ready, prepared, or operational.

That kind of usage is common with machines, devices, and systems.

Er is the present tense of å være = to be.

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• hjertestarteren er = the defibrillator is

Unlike English, Norwegian does not change the present-tense verb for different persons:

• jeg er
• du er
• vi er

It stays er.

This is the normal word order for a simple statement:

• subject + verb + adjective
• Hjertestarteren
  • er
    • klar

So the sentence structure is very straightforward.

But Norwegian main clauses follow the verb-second rule, which means the finite verb is usually in the second position. For example:

• Nå er hjertestarteren klar. = Now the defibrillator is ready.

And in a yes/no question:

• Er hjertestarteren klar? = Is the defibrillator ready?

So the sentence itself is simple, but it fits into an important Norwegian word-order pattern.

A good learner-friendly approximation is:

YER-te-stahr-ter-en

A few useful points:

• The hj at the beginning is usually pronounced with a y sound, not a strong English h.
• The j in Norwegian is usually like English y.
• The r can sound different depending on dialect.
• In natural speech, the ending may sound a bit reduced, especially in some dialects.

You do not need a perfect dialect pronunciation right away. The most important thing is to avoid pronouncing hj like English hj.

Yes, hjertestarter is a very common everyday Norwegian word for this kind of device, especially in public information and signage.

It is quite literal: heart starter.

You may also see or hear defibrillator, especially in more technical or medical contexts, but hjertestarter is very common and natural in ordinary Norwegian.