An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
To find the number of electrons that flow through a device operating at a current of 15.0 A for 30 seconds, we first calculate the total charge as 450 coulombs. Then, using the charge of a single electron, we determine that approximately 2.81 x 10^21 electrons pass through the device. This calculation emphasizes the relationship between current, charge, and elementary charge in understanding electric flow.
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The task is to fill in a table with the correct forms of Spanish adjectives based on noun-adjective agreement.
Adjectives must agree in gender (masculine/feminine) and number (singular/plural) with the nouns they describe.
Masculine singular nouns (el) take adjectives ending in -o.
Feminine singular nouns (la) take adjectives ending in -a.
Plural nouns (los/las) take adjectives ending in -s.
Adjectives ending in letters other than -o/-a are neutral and do not change based on gender.
La bicicleta es (cómodo): bicicleta is feminine singular, so cómodo becomes cómoda.
La motocicleta es (rápido): motocicleta is feminine singular, so rápido becomes rápida.
Las computadoras son (inteligente): computadoras is feminine plural, so inteligente remains inteligente since it ends in -e.
Los carros son (pequeño): carros is masculine plural, so pequeño becomes pequeños.
Las casas son (bonito): casas is feminine plural, so bonito becomes bonitas.
The completed table is as follows:
Sentence
Adjective
Los autos son
atractivos
La bicicleta es
cómoda
La motocicleta es
rápida
Las computadoras son
inteligente
Los carros son
pequeños
Las casas son
bonitas
Explanation
Understanding the Problem We need to fill in the table with the correct forms of the adjectives in parentheses, ensuring they agree with the nouns in gender and number.
Example The first row is already completed as an example: Los autos son (atractivo) -> atractivos.
Applying the rules La bicicleta es (cómodo): bicicleta is feminine singular, so cómodo becomes cómoda.
Applying the rules La motocicleta es (rápido): motocicleta is feminine singular, so rápido becomes rápida.
Applying the rules Las computadoras son (inteligente): computadoras is feminine plural, so inteligente remains inteligente since it ends in -e.
Applying the rules Los carros son (pequeño): carros is masculine plural, so pequeño becomes pequeños.
Applying the rules Las casas son (bonito): casas is feminine plural, so bonito becomes bonitas.
Final Answer The completed table is as follows:
Sentence
Adjective
Los autos son
atractivos
La bicicleta es
cómoda
La motocicleta es
rápida
Las computadoras son
inteligente
Los carros son
pequeños
Las casas son
bonitas
Examples
Understanding adjective-noun agreement is crucial in Spanish, just like subject-verb agreement in English. For example, if you're describing a group of friends ('amigos') as funny, you'd say 'Los amigos son divertidos' (masculine plural). If you're describing a female friend ('amiga') as intelligent, you'd say 'La amiga es inteligente' (feminine singular). This agreement ensures clear and accurate communication, preventing misunderstandings and making your Spanish sound more natural and fluent. It's similar to making sure your descriptions match the person or thing you're talking about!
