Întrerupătorul este lângă ușă.

In Romanian, the definite article is usually attached to the end of the noun.

• întrerupător = switch
• întrerupătorul = the switch

This is very normal in Romanian:

• băiat = boy
• băiatul = the boy
• scaun = chair
• scaunul = the chair

So întrerupătorul literally means switch-the, but in natural English it is just the switch.

Întrerupător means switch, and in everyday home-related contexts it often means a light switch.

So in this sentence, întrerupătorul is most naturally understood as the switch or the light switch.

Yes. Este and e both mean is.

• Întrerupătorul este lângă ușă.
• Întrerupătorul e lângă ușă.

Both are correct.

The difference is mainly style:

• este = a bit fuller, slightly more formal or careful
• e = very common in everyday speech

Romanian normally does not leave out is in this kind of sentence, so you need either este or e.

Lângă means near, next to, or by.

In this sentence, lângă ușă means next to the door or by the door.

Some similar examples:

• lângă masă = next to the table
• lângă fereastră = by the window
• lângă casă = near the house

So the structure is:

• X este lângă Y = X is next to Y

This is a very common question. Romanian often uses a noun without the definite article after a preposition, especially in ordinary location expressions.

So:

• lângă ușă = by/next to the door

Even though English uses the door, Romanian often prefers the bare noun here.

You can also find definite forms after prepositions, but they usually sound more specific or are followed by extra information:

• lângă ușa de la intrare = next to the entrance door
• lângă ușa aceea = next to that door

So lângă ușă is a very natural way to say by the door in a general location sense.

Yes, gender matters in Romanian.

• întrerupător is masculine in the singular
• ușă is feminine

That helps explain their forms:

• masculine singular definite often ends in -ul
  
  • întrerupător → întrerupătorul
• feminine singular often has forms like -ă in the indefinite and -a in the definite
  
  • ușă = a door
  • ușa = the door

So the forms in the sentence match normal Romanian gender patterns.

A rough pronunciation guide is:

în-treh-roo-puh-TOH-rul ES-te LUN-guh OO-shuh

A few important sounds:

• î = a central vowel that English does not really have; it sounds somewhat like a muted uh, but higher and tighter
• ă = a short uh sound, like the a in sofa
• ș = sh

So:

• ușă sounds roughly like oo-shuh
• lângă sounds roughly like LUN-guh

The normal neutral order here is:

• Întrerupătorul este lângă ușă.

This is the most straightforward way to say it.

But Romanian can change word order for emphasis:

• Lângă ușă este întrerupătorul.

That version puts more focus on the location, as if answering Where is the switch?

So the original sentence is the most neutral and standard version, but other orders are possible.

More or less, yes:

• Întrerupătorul = the switch
• este = is
• lângă = next to / by
• ușă = door

So a very literal breakdown is:

• The switch is next to door

But natural English needs the door, while Romanian naturally says ușă in this kind of prepositional phrase.

So the best natural translation is:

• The switch is next to the door.