Learn Spanish (Latin America): Nuestro televisor es caro.

In Spanish, possessive adjectives like nuestro (our) change to match the thing being owned, not the owners! Because televisor (television) is a singular, masculine noun, you use the singular, masculine form nuestro. If you owned multiple TVs, it would be nuestros televisores.

I thought television was televisión. Why does this use televisor?

Televisor refers to the actual physical machine (the TV set). Televisión usually refers to the broadcast, the channels, or the programming you watch. Since the physical machine itself is what costs a lot of money, televisor is the best word here.

Why use es instead of está?

We use es (from the verb ser) because being expensive (caro) is considered a basic characteristic of this TV, rather than a temporary state or condition.

Does the word for expensive (caro) change depending on the object?