In a teacher-centered classroom, the primary role of the teacher is option b: Discover content and maintain control. ;
A device delivering 15.0 A for 30 seconds will allow approximately 2.81 × 1 0 21 electrons to flow through it. This is calculated by first finding the total charge and then converting that charge to the number of electrons. The total charge is 450 C , and using the charge of a single electron, we determine the number of electrons.
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