Speaker di ruang kelas tiba-tiba mati, jadi guru memindahkan kami ke ruangan lain.

Yes. Speaker is very commonly used in everyday Indonesian to mean a loudspeaker, classroom speaker, computer speaker, and so on. It is a borrowing from English.

A more fully Indonesian option would be pengeras suara, but in casual modern Indonesian, speaker is very natural.

So:

• speaker = speaker / loudspeaker
• pengeras suara = loudspeaker / sound system device

In this sentence, speaker di ruang kelas means the speaker in the classroom.

Di is a preposition meaning in / at / on, depending on context.

So:

• di = in / at
• ruang kelas = classroom

Together, di ruang kelas means in the classroom.

A useful point: di as a preposition is written separately:

• di ruang kelas = in the classroom

But di- as a passive prefix is attached to a verb:

• dipindahkan = was moved

That spelling difference is very important in Indonesian.

Both ruang and ruangan can mean room, and in many situations they overlap.

In this sentence:

• ruang kelas = classroom
• ruangan lain = another room

A rough tendency is:

• ruang often sounds a bit more like the basic noun, and it appears in fixed combinations such as ruang kelas, ruang tamu, ruang makan
• ruangan can sound a bit more like a room/an enclosed space as an individual place

But in real usage, there is a lot of overlap, and learners will hear both.
You should especially memorize common set phrases like:

• ruang kelas = classroom
• ruang tamu = living room / guest room
• ruang kerja = workspace / office room

Tiba-tiba means suddenly.

It comes from reduplication, which is very common in Indonesian. In this case, you should learn tiba-tiba as a fixed adverb meaning all of a sudden / suddenly.

Examples:

• Lampunya tiba-tiba mati. = The light suddenly went out.
• Dia tiba-tiba tertawa. = He/She suddenly laughed.

So in your sentence:

• speaker di ruang kelas tiba-tiba mati = the classroom speaker suddenly died/went out/stopped working

In Indonesian, mati is used not only for living things but also very naturally for machines, devices, lights, engines, and electricity when they stop working or turn off.

So mati can mean:

• dead
• off
• not working
• stopped functioning

Examples:

• Lampunya mati. = The light is off / went out.
• TV-nya mati. = The TV is off / stopped working.
• Mesinnya mati. = The engine died / stalled.

So here, speaker ... mati means the speaker stopped working or went dead, not literally died in a biological sense.

Here, jadi means so or therefore.

It connects the first event to the result:

• Speaker di ruang kelas tiba-tiba mati, jadi...
• The classroom speaker suddenly stopped working, so...

It is very common in spoken and written Indonesian for showing consequence.

Compare:

• Saya lelah, jadi saya pulang. = I’m tired, so I went home.
• Hujan, jadi kami tidak keluar. = It was raining, so we didn’t go out.

Great question. This is a very common thing learners ask.

• pindah usually means to move or to move oneself / change location
• memindahkan means to move something/someone or to transfer

So:

• Kami pindah ke ruangan lain. = We moved to another room.
• Guru memindahkan kami ke ruangan lain. = The teacher moved us to another room.

The verb memindahkan is a causative/transitive form based on pindah:

• meN- ... -kan

It shows that the subject causes the object to move.

In this sentence:

• guru = subject
• kami = object
• ke ruangan lain = destination

So the teacher is the one causing the move.

Because pindah by itself is not normally used that way for a direct object.

Indonesian usually distinguishes:

• pindah = move, relocate
• memindahkan sesuatu/seseorang = move something/someone

So:

• Kami pindah. = We moved.
• Guru memindahkan kami. = The teacher moved us.

Using memindahkan tells you clearly that the verb is acting on an object.

Because kami means we/us excluding the listener, while kita includes the listener.

In this sentence, kami is translated as us, referring to the students. The teacher moved us to another room. The listener is probably not part of that group, so kami is the natural choice.

Quick contrast:

• kami = we/us, not including you
• kita = we/us, including you

Examples:

• Guru memindahkan kami... = The teacher moved us...
• Sekarang kita masuk ke ruangan lain. = Now let’s go into another room.
  Here kita includes the person being spoken to.

Ke is a preposition meaning to for movement toward a place.

So:

• di ruang kelas = in the classroom
• ke ruangan lain = to another room

This is a very important contrast:

• di = location
• ke = direction / destination

Examples:

• Saya di rumah. = I am at home.
• Saya ke rumah teman. = I am going to a friend’s house.

In your sentence, the movement is toward a new place, so ke is required.

Lain means other / another / different.

In Indonesian, words like this usually come after the noun:

• ruangan lain = another room
• buku lain = another book
• cara lain = another way

So unlike English, where another comes before the noun, Indonesian commonly puts lain after it.

Yes, this sentence is very natural.

The structure is:

• Speaker di ruang kelas = topic/subject
• tiba-tiba mati = suddenly stopped working
• jadi = so
• guru memindahkan kami ke ruangan lain = the teacher moved us to another room

A few natural alternatives are possible, for example:

• Speaker di kelas tiba-tiba mati, jadi guru memindahkan kami ke ruangan lain.
• Karena speaker di ruang kelas tiba-tiba mati, guru memindahkan kami ke ruangan lain.

The second version uses karena = because.

But your original sentence is completely normal and easy to understand.

Yes. Indonesian does not have articles like a, an, and the, so context decides.

So speaker di ruang kelas could be understood as:

• the speaker in the classroom
• a speaker in the classroom

In this sentence, the context makes it sound like a specific classroom speaker, so English would usually translate it as the speaker in the classroom.

This is very common in Indonesian: nouns often appear without articles, and you infer definiteness from the situation.