Ota johto irti seinästä.

Ota is the singular imperative of ottaa (to take).

So ota means take! or remove! when speaking to one person.

Related forms:

• ottaa = to take
• ota! = take! (to one person)
• ottakaa! = take! (to several people / polite plural)

In this sentence, the verb is being used in the sense take/remove rather than literally just pick up.

This is a very common Finnish object-case question.

In Ota johto irti seinästä, johto is the object of the verb, and it appears in the nominative singular form.

Why? Because with a positive imperative, a total object is often in the nominative:

• Ota johto = take/remove the cord

Compare:

• Otan johdon. = I take the cord
• Ota johto! = Take the cord!

So even though learners often expect johdon, the imperative changes the object form here.

Irti means something like off, loose, detached, or free from attachment.

In this sentence, it shows the result of the action: the cord should end up disconnected from the wall.

A useful pattern is:

• ottaa X irti Y:stä = to take/remove X off/from Y

So:

• Ota johto irti seinästä = remove the cord from the wall / unplug the cord from the wall

Irti is not an adjective agreeing with johto. It functions more like an adverb/result word here.

Seinästä is the elative case of seinä (wall), and the elative usually means out of or from.

So literally:

• seinästä = from the wall

In this context, Finnish often uses wall to mean the wall socket / outlet by implication. That is why the sentence sounds literally like take the cord off/from the wall.

A more explicit version would be:

• Ota johto irti pistorasiasta. = Remove the cord from the socket.

But seinästä is natural because the socket is understood to be in the wall.

Johto usually means cord, cable, or lead.

In this sentence, it refers to the power cord as a whole, not specifically just the metal plug part. In practice, though, English often says unplug it, while Finnish may talk about the cord.

So johto here is best understood as:

• the power cord
• the cable that is plugged into the wall

Finnish has no articles, so it does not have separate words for a or the.

That means:

• johto can mean a cord or the cord
• seinästä can mean from a wall or from the wall

The exact meaning depends on context. In a practical instruction like this, English naturally uses the:

• Take the cord out of the wall
• Unplug the cord from the wall

Yes. Ota johto irti seinästä is a normal and natural word order.

Very roughly:

• Ota = verb
• johto = object
• irti = result/state (off, detached)
• seinästä = source (from the wall)

Finnish word order is somewhat flexible, but this version is straightforward and idiomatic.

You may also hear:

• Ota johto seinästä irti.

That is also natural. The meaning stays the same, but the placement of irti and seinästä can shift slightly depending on rhythm or emphasis.

Yes, definitely.

• Ota johto irti pistorasiasta.
  = Remove the cord from the socket / unplug it from the outlet.

This is more explicit, because pistorasia means power socket / outlet.

Compare:

• seinästä = from the wall
• pistorasiasta = from the socket/outlet

Both can be natural, but pistorasiasta is more precise.

Yes. Finnish has several natural ways to express this idea.

For example:

• Ota johto irti seinästä.
• Irrota johto seinästä.
• Vedä johto irti seinästä.

Nuances:

• ottaa ... irti = take/remove ... off
• irrottaa / irrota = detach, disconnect
• vetää ... irti = pull ... out/off

If you specifically mean unplug, irrottaa or vetää irti can sound especially clear, but ottaa johto irti seinästä is still understandable and natural.

Not necessarily.

The imperative in Finnish is commonly used for:

• instructions
• directions
• warnings
• practical commands

So Ota johto irti seinästä can sound perfectly normal in the right situation, especially in instructions or when telling someone what to do for safety.

If you want to make it softer, Finnish can add polite wording, for example:

• Ota johto irti seinästä, ole hyvä.
• Voisitko ottaa johdon irti seinästä? = Could you unplug the cord from the wall?

So the plain imperative is direct, but not automatically impolite.