A cobrança indevida aparece na conta de luz.

Cobrança is a feminine singular noun, so the article and adjective also have to be feminine singular:

• a = feminine singular the
• cobrança = charge / billing / fee
• indevida = improper, incorrect, unauthorized

So:

• o cobrança indevido ❌
• a cobrança indevida ✅

This is standard gender and number agreement in Portuguese.

Cobrança can mean several related things depending on context, such as:

• a charge
• a billing
• a fee being collected
• a collection demand

In this sentence, it most naturally means an incorrect charge or improper billing item on the electricity bill.

So it is not just the abstract idea of billing in general; it refers to a specific charge that appears on the bill.

In Portuguese, adjectives often come after the noun, especially in normal, factual descriptions.

So:

• cobrança indevida = improper/unauthorized charge

That is the most natural order here.

You can sometimes move adjectives before the noun in Portuguese, but that often changes the tone or emphasis. In this case, indevida cobrança would sound unusual and much less natural.

Not exactly.

Indevida usually means something like:

• improper
• undue
• unauthorized
• not legitimately owed

It is very common in legal, administrative, customer-service, and billing contexts.

Errada just means wrong or incorrect in a more general way.

So:

• cobrança errada = a wrong charge
• cobrança indevida = a charge that should not be there / is improperly being charged

In billing language, indevida often sounds more precise and more natural.

Aparece is the present indicative of the verb aparecer.

Here it means:

• appears
• shows up
• is showing up
• sometimes naturally in English: is listed

Examples:

• O nome aparece no sistema. = The name appears in the system.
• A taxa aparece na fatura. = The fee appears on the bill.

So A cobrança indevida aparece... means the improper charge shows up / appears on the bill.

Because aparecer emphasizes that something shows up, appears, or is present/visible in that place.

Compare:

• A cobrança indevida aparece na conta de luz. = The improper charge appears/shows up on the electricity bill.

• A cobrança indevida está na conta de luz. = The improper charge is on the electricity bill.

Both can work, but aparece often sounds more natural when talking about something that is listed, displayed, or unexpectedly showing up on a bill, screen, statement, or document.

Na is a contraction of:

• em + a = na

So:

• na conta = in the bill / on the bill

Portuguese very commonly contracts em with definite articles:

• em + o = no
• em + a = na
• em + os = nos
• em + as = nas

Examples:

• no sistema = in the system
• na fatura = on the bill

Because conta de luz is a fixed, common expression in Brazilian Portuguese meaning electricity bill.

Here, de luz works like a category label:

• conta de luz = electricity bill
• conta de água = water bill
• conta de telefone = phone bill

Using da would usually suggest something more literally tied to the light, which is not the normal expression for a utility bill.

So for the utility meaning, conta de luz is the standard phrase.

Yes, literally it does. But in actual use, it means electricity bill.

This is one of those very common everyday expressions in Brazilian Portuguese where the literal wording is not the best translation.

Other common ways to say it include:

• conta de energia
• fatura de energia elétrica

But conta de luz is extremely common in everyday speech.

Yes, often you can, but the tone changes slightly.

• conta de luz = very common everyday phrase
• fatura de energia / fatura de luz = more formal, more like invoice or billing statement

So:

• A cobrança indevida aparece na conta de luz. = very natural everyday Brazilian Portuguese
• A cobrança indevida aparece na fatura de energia. = also correct, slightly more formal

Portuguese often uses definite articles in places where English might not.

Here, a cobrança indevida can refer to:

• a specific improper charge already known in the context, or
• the improper charge being discussed as a definite item on the bill

Portuguese tends to sound more natural with the article here. Omitting it:

• Cobrança indevida aparece na conta de luz

would sound less natural as a normal full sentence in standard usage.

Yes. Portuguese allows some flexibility.

The original order:

• A cobrança indevida aparece na conta de luz.

A possible variation:

• Na conta de luz aparece a cobrança indevida.

Both are grammatical, but the original sentence is the most neutral and natural for most contexts.

The version starting with na conta de luz puts more emphasis on the location.

A rough pronunciation guide is:

ah koh-BRAN-sah een-deh-VEE-dah ah-pah-REH-see nah KON-tah jeh looz

A few helpful notes:

• cobrança: the ç sounds like s
• indevida: stress on vi → indeVIda
• aparece: stress on re → apaREce
• de luz in Brazilian Portuguese often sounds closer to ji luz or dji luz, depending on accent

You do not need to pronounce it exactly like the guide above, but the main stress points are important:

• coBRANça
• indeVIda
• apaREce