2 ELECTRIC DISCHARGES, WAVES AND
condenser C is charged, the current in the line A and the eoudenaer
C is zero again. That is, the permanent condition before cloning
the switch S, and also some time after the cloning of the mviteh,
is zero current in the line. Immediately after the Honing of
the switch, however, current flows for a more* or less short time.
With the condition of the circuit unchanged; the same generator
voltage, the switch S cloned on the same circuit, the current
nevertheless changes, increasing from s$erot at the moment of
closing the switch $, to a maximum, and then decreasing again to
zero, while the condenser charges from s$ero voltage to the genera-
tor voltage. We then here meet a transient phenomenon, in the
charge of the condenser from a source of continuous voltage.
C is zero again. That is, the permanent condition before cloning
the switch S, and also some time after the cloning of the mviteh,
is zero current in the line. Immediately after the Honing of
the switch, however, current flows for a more* or less short time.
With the condition of the circuit unchanged; the same generator
voltage, the switch S cloned on the same circuit, the current
nevertheless changes, increasing from s$erot at the moment of
closing the switch $, to a maximum, and then decreasing again to
zero, while the condenser charges from s$ero voltage to the genera-
tor voltage. We then here meet a transient phenomenon, in the
charge of the condenser from a source of continuous voltage.
__ A ___ ______ _______
Of O
Pig. 2.
Commonly, transient and permanent i>htmom<wa art*
imposed upon each other. For instance, if in the circuit Fig* 1
we close the switch 8 connecting a fan motor F9 at the moment of
closing the switch 8 the current in the fan-motor circuit in ssero,
It rapidly rises to a maximum, the motor starts, its speed mcrcawH
while the current decreases, until finally speed and current hmmm
constant; that is, the permanent condition is reached
imposed upon each other. For instance, if in the circuit Fig* 1
we close the switch 8 connecting a fan motor F9 at the moment of
closing the switch 8 the current in the fan-motor circuit in ssero,
It rapidly rises to a maximum, the motor starts, its speed mcrcawH
while the current decreases, until finally speed and current hmmm
constant; that is, the permanent condition is reached
The transient, therefore, appears as intermediate between two
permanent conditions; in the above instance, the fan motor din-
connected, and the fan motor running at full speed The quwtbn
then arises, why the effect of a change in the coiulitionH of an
electric circuit does not appear instantaneously, hut only after a
transition period, requiring a finite, though frequently very nhort,
time.
permanent conditions; in the above instance, the fan motor din-
connected, and the fan motor running at full speed The quwtbn
then arises, why the effect of a change in the coiulitionH of an
electric circuit does not appear instantaneously, hut only after a
transition period, requiring a finite, though frequently very nhort,
time.
2, Consider the simplest case; an electric power tranMitibdkm
(Pig. 3). In the generator 0 electric power m produced from me-
chanical power, and supplied to the Una A. In the line A MOIUU of
this power is dissipated, the rest transmitted into the load &,
where the power is used, The consideration of the electric poww
(Pig. 3). In the generator 0 electric power m produced from me-
chanical power, and supplied to the Una A. In the line A MOIUU of
this power is dissipated, the rest transmitted into the load &,
where the power is used, The consideration of the electric poww