Tento spotřebič spotřebuje hodně elektřiny.

Tento means this.

Czech has both ten and tento, but tento is more explicitly this here / this specific one. In everyday speech, people often use ten for both the and this/that, depending on context, but tento is clearer and a bit more precise.

So:

• tento spotřebič = this appliance
• ten spotřebič can also occur in speech, but it is less explicit

Also, tento changes for gender, number, and case. Here it is masculine singular nominative because spotřebič is masculine singular and is the subject.

Spotřebič means appliance or device, especially one that uses electricity or energy.

Typical examples:

• elektrický spotřebič = electrical appliance
• domácí spotřebič = household appliance

It comes from the same word family as the verb spotřebovat / spotřebovávat, which means to consume / to use up.

So learners often notice the connection:

• spotřebič = a thing that consumes
• spotřebuje = consumes / will consume

Because they are related words from the same root:

• spotřeba = consumption
• spotřebovat = to consume, to use up
• spotřebovávat = to be consuming, to consume habitually
• spotřebič = appliance, literally something like a consumer device

This is very common in Czech: nouns and verbs are often built from the same root, so recognizing word families helps a lot.

Spotřebuje is the 3rd person singular form, because the subject is tento spotřebič = this appliance.

So the basic agreement is:

• já spotřebuji / spotřebuju
• ty spotřebuješ
• on / ona / ono spotřebuje
• my spotřebujeme
• vy spotřebujete
• oni spotřebují

Here:

• subject = spotřebič
• verb = spotřebuje

So the sentence structure is simply:

• Tento spotřebič = subject
• spotřebuje = verb
• hodně elektřiny = object phrase

Grammatically, spotřebuje is from the perfective verb spotřebovat, so its present-tense form usually has future meaning:

• spotřebuje = will consume / will use up

That is an important point for learners. If you want a general, habitual meaning like This appliance consumes a lot of electricity, Czech often prefers an imperfective verb such as:

• Tento spotřebič spotřebovává hodně elektřiny.

or a more idiomatic phrasing such as:

• Tento spotřebič má vysokou spotřebu elektřiny.
  = This appliance has high electricity consumption.

So your sentence is understandable, but many learners will want to know that spotřebuje naturally sounds more like will consume or will use up than a timeless general fact.

Because after hodně in this meaning, Czech normally uses the genitive.

The basic noun is:

• elektřina = electricity

But after quantity expressions like hodně (a lot of), it becomes:

• hodně elektřiny = a lot of electricity

This is a very common pattern in Czech:

• hodně vody = a lot of water
• hodně času = a lot of time
• hodně peněz = a lot of money
• hodně práce = a lot of work

So elektřiny here is genitive singular.

Two reasons:

1. hodně is a normal and very common way to say a lot of
2. the noun after it must be in the genitive

So:

• hodně elektřiny = correct
• mnoho elektřiny = also correct, a bit more formal/bookish
• hodně elektřina = incorrect
• mnoho elektřina = incorrect

Both hodně and mnoho trigger the genitive:

• hodně elektřiny
• mnoho elektřiny

In everyday speech, hodně is often the more natural choice.

Czech has no articles like English a and the.

That means spotřebič by itself can mean:

• an appliance
• the appliance
• just appliance in the right context

The word tento helps specify it:

• tento spotřebič = this appliance

So Czech relies on context, word order, and demonstratives like ten, tento, tamten instead of articles.

It is in the nominative, because it is the subject of the sentence.

You can see that both words match:

• tento = masculine singular nominative
• spotřebič = masculine singular nominative

That agreement is very important in Czech. Adjectives, demonstratives, and some pronouns must match the noun in gender, number, and case.

The neutral word order is:

• Tento spotřebič spotřebuje hodně elektřiny.

That is a normal subject–verb–object order.

But Czech word order is more flexible than English, and changing it can shift emphasis:

• Tento spotřebič spotřebuje hodně elektřiny.
  Neutral: This appliance will consume a lot of electricity.

• Hodně elektřiny spotřebuje tento spotřebič.
  Emphasis on a lot of electricity.

• Tento spotřebič hodně elektřiny spotřebuje.
  Slightly marked; can emphasize the amount.

So the original order is the safest and most neutral for learners.

A learner-friendly approximation is:

TEN-to spo-TŘE-bi tch spo-TŘE-bu-ye HOD-nye e-LEK-tři-ny

A few pronunciation notes:

• ř is the famous Czech sound; it is difficult for English speakers
• č in spotřebič sounds like ch in church
• ě in spotřebuje affects pronunciation so that buje sounds roughly like bu-ye
• stress in Czech is almost always on the first syllable of each word:
  • TENto
  • SPOtřebič
  • SPOtřebuje
  • HODně
  • eLEKtřiny

Yes, it is understandable, but many speakers might choose a slightly different form depending on the intended meaning.

If you mean a general characteristic:

• Tento spotřebič spotřebovává hodně elektřiny.
• Tento spotřebič má vysokou spotřebu elektřiny.

If you mean a future or one-time result:

• Tento spotřebič spotřebuje hodně elektřiny.

So the sentence is useful for learning, but the best version depends on whether you mean:

• habitual/general consumption or
• future/completed consumption