An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
The total charge delivered by the device is 450 Coulombs over 30 seconds. This corresponds to approximately 2.81 × 10^{21} electrons flowing through the device. The calculations involve using the relations between current, charge, and the charge of an electron.
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For these questions, we need to choose the correct form of the verb that matches the subject of each sentence.
I ____ the dishes in the bathtub:
The subject 'I' requires the base form of the verb, so the correct choice is (a) wash .
They always ____ when they're cold:
The subject 'They' is plural, so we use the base form of the verb, making the correct choice (a) shiver .
Do you usually ____ your eyes when you're scared?:
After the auxiliary verb 'do,' we use the base form of the main verb. Therefore, the correct choice is (b) cover .
Why are you ____ the carpet?:
After 'are,' we need the present participle form of the verb, which ends in '-ing', so the correct answer is (a) sweeping .
When I'm embarrassed, I ____:
The subject 'I' requires the base form of the verb, and no auxiliary verb precedes it, so the correct choice is (c) blush .
These questions are generally about recognizing and using the correct verb forms in various contexts, which is a key part of learning English grammar. Understanding how to match subjects with the correct verb forms ensures clarity and accuracy in communication.
