Which of the following is a
measurement of electric potential difference? (A) 112 amperes, (B) 236 joules,
(C) 24 volts, (D) 360 watts, (E) 49 coulombs.
We’re being asked here to identify
which of five options is a measurement of electric potential difference. Let’s recall that a complete
description of a measurement includes three things: the quantity being measured, the
measured value, and the unit associated with that value. In this case, the quantity that’s
being measured is electric potential difference. We’re told this in the question
text. As for the value, we can see that
all five answer options begin with a numerical value.
To determine which of these options
can be a measurement of electric potential difference though, we need to consider
the unit associated with each value. Specifically, we need to identify
which option shows a measurement that uses the correct unit of electric potential
Let’s recall that the SI unit for
electric potential difference is the volt, named after Italian scientist and
inventor of the battery Alessandro Volta. This unit is abbreviated with the
symbol capital V.
We can see then that the only
answer option in units of volts is option (C). The measurement of electric
potential difference from this list of options is 24 volts.