Video Transcript
The mathematical expression current
equals dot dot dot divided by time is an equation with three quantities in it. Two of the quantities have been
filled in, current and time. What quantity goes in the numerator
of the fraction?
In this question, we are given a
mathematical expression for current with one of the quantities missing. We’re asked to fill in the
blank. Recall that current is a flow of
charge in an electrical circuit. Current is measured in units of
amperes and is a measure of the amount of charge that passes a point in the circuit
every second. We can calculate the current in a
circuit by dividing the amount of charge that passes a point by how much time the
charge was measured for.
Our incomplete expression tells us
that current is equal to some quantity divided by time. From the definition of current, we
know that the quantity of charge should go in the numerator. So the correct answer to this
question is “charge.”
