Innstungan virkar stundum ekki, svo hún virðist laus.

The outlet sometimes doesn’t work, so it seems loose.

Breakdown of Innstungan virkar stundum ekki, svo hún virðist laus.

• ekki: not
• stundum: sometimes
• svo: so
• virka: to work

Questions & Answers about Innstungan virkar stundum ekki, svo hún virðist laus.

What does innstungan mean, and why does it end in -an?

Innstunga is a feminine noun meaning something like a plug / socket / insertion point (the exact English label depends on context).
The ending -an is the definite article attached to the noun:

• innstunga = an innstunga (indefinite)
• innstungan = the innstunga (definite)
  For many feminine nouns ending in -a, the nominative singular definite form is -an (e.g., tunga → tungan).

Why is it virkar (not virka or something else)?

Virka is the verb to work / function. Here it’s in the present tense, 3rd person singular because the subject is Innstungan (singular):

• ég virka? (not used like that in this meaning)
• hún/það/þetta virkar = it works
  So Innstungan virkar = The plug/socket works.

How does the negation ekki work in virkar stundum ekki?