Electric current by definition
is the flow of electrons. That is what electricity is.
Electricity -- like water flowing through a pipe -- can be
stopped by preventing its flow.
The flow of electrons can be
stopped by doing what is termed "breaking the circuit". That
means by terminating the wire or conductor material so that
the electricity cannot move along that path.
The sparks you see in the
cases of static electricity and lightening result from their
circuits having been opened -- broken and therefore
In these two cases the voltage
(pressure) was great enough to make the current jump the
gap. In the first case, the gap may be between your finger
and another person; in the second case, the gap is between a
cloud mass and the earth.