  Some voltage sources are transient, lasting only for a moment of time, such
as the voltage generated by converting a human motion into electricity. Such
sources moreover tend to have a degree of randomness as well as internal
resistance. We investigate how to put a number to how valuable a given
transient source is. We derive several candidate measures via a systematic
approach. We establish an inter-convertibility hierarchy between such sources,
where inter-conversion means adding passive interface circuits to the sources.
Resistors at the ambient temperature are at the bottom of this hierarchy and
sources with low internal resistance and high internal voltages are at the top.
We provide three possible measures for a given source that assign a number to
the source respecting this hierarchy. One measure captures how much ``unitdc"
the source contains, meaning $1$ V dc with $1\Omega$ internal resistance for
$1$s. Another measure relates to the signal-to-noise ratio of the voltage
time-series whereas a third is based on the relative entropy between the
voltage probability distribution and a thermal noise resistor. We argue that
the unitdc measure is particularly useful by virtue of its operational
interpretation in terms of the number of unit dc sources that one needs to
combine to create the source or that can be distilled from the source.
