La potencia contratada aparece en la factura.

In Spain, potencia contratada is a fixed electricity term. It means the contracted electrical power level for a home or business — basically, the maximum power you are allowed to use at once according to your electricity contract.

So this is not just any kind of power in a general sense; it is utility-bill vocabulary.

Because potencia is a singular feminine noun, and in Spanish common nouns usually need an article when you are talking about a specific thing.

• la potencia = the power
• la factura = the bill / invoice

In this sentence, it means a specific item on a specific kind of document, so la sounds natural.

Because grammatical gender is a property of the noun in Spanish. Potencia is simply a feminine noun, so it takes feminine forms:

• la potencia
• potencia contratada

This does not mean the thing itself is biologically feminine; it is just grammar.

Because contratada agrees with potencia, which is feminine singular.

Compare:

• potencia contratada = feminine singular
• servicio contratado = masculine singular
• tarifas contratadas = feminine plural
• planes contratados = masculine plural

So the ending changes to match the noun it describes.

Here it functions like an adjective, even though it comes from the verb contratar.

Literally, it is the past participle of contratar, but in this sentence it describes the noun:

• potencia contratada = contracted power

You can think of it as a shortened version of:

• la potencia que has contratado
• the power that you have contracted

So grammatically it behaves adjectivally here.

Because the subject is singular: la potencia contratada.

The whole subject is one thing:

• La potencia contratada = singular
• so the verb must be singular: aparece

If the subject were plural, the verb would change:

• Los datos aparecen en la factura.

Here aparece means appears, shows up, or more naturally in English, is shown or is listed.

On documents, Spanish often uses aparecer to mean that information is included or visible:

• Tu nombre aparece en el contrato.
• El importe aparece en la factura.

So it does not mean something dramatic like suddenly appearing; it just means the information is there on the bill.

Both can be possible in some contexts, but they are not exactly the same.

• aparece en la factura = it appears / is shown / is listed on the bill
• está en la factura = it is on the bill

Aparece focuses a bit more on the fact that the information is displayed or included as an item on the document. It is very natural for documents, screens, lists, and forms.

It can mean both, depending on context. In this sentence, especially with potencia contratada, it most naturally means a utility bill, specifically an electricity bill.

In Spain, factura is commonly used for:

• a bill you receive
• an invoice issued by a company
• a utility bill

So here la factura would usually be understood as the electricity bill.

Because en is the normal preposition for something being in or on a document.

Spanish uses en where English might say on:

• en la factura = on the bill
• en el documento = in/on the document
• en la página = on the page

So even though English often says on the bill, Spanish prefers en la factura.

No, not grammatically. It is an active sentence:

• subject: La potencia contratada
• verb: aparece
• complement: en la factura

A more passive-like version would be:

• La potencia contratada está indicada en la factura.
• La potencia contratada viene indicada en la factura.

But aparece is simply an active verb here.

Yes, Spanish allows more flexibility than English, but the original order is the most neutral and natural.

Standard order:

• La potencia contratada aparece en la factura.

Possible variation:

• En la factura aparece la potencia contratada.

That version puts more emphasis on where it appears. Both are correct, but the original is the safest default for learners.

They would most likely understand it as:

The contracted electricity capacity is shown on the bill.

In everyday use, especially in Spain, this sounds like information about what details can be found on an electricity bill. It is practical, administrative language rather than casual conversation.

A simple pronunciation guide is:

la poh-TEN-thya kon-tra-TA-da a-pa-RE-the en la fak-TU-ra

In much of Spain:

• c before e/i sounds like th in think
• so potencia sounds roughly like poh-TEN-thya
• aparece sounds roughly like a-pa-RE-the

In Latin American Spanish, those c sounds would usually be an s sound instead.