Video Transcript
Which of the following are units of A equivalent to? (A) C divided by s, (B) C, (C) s divided by C, (D) C multiplied by s, or (E) C
divided by s squared.
This question is asking us to choose which unit shown is the correct equivalent to
the unit symbol A. Let’s recall that A is the symbol that stands for ampere, which is the unit for
current. Let’s also recall that current is the amount of charge passing through a point in a
circuit per second.
To answer this question, we need to write out our definition of current, but in the
form of an equation. To do this, we need to know the symbols of the units for charge and time.
Charge has units of coulombs, which have the unit symbol C. Time is measured in seconds, which have the unit symbol s. The current in a circuit is equal to the amount of charge that passes a point in a
given time divided by the time it takes for the charge to pass that point. From this equation, we can see that the unit of current, A, is equal to the unit for
charge, C, divided by the unit for time, s. So we can see that the unit equivalent to A is C divided by s.
This means that our final answer is option (A), C divided by s.
