Call pulse devices, I work not continuously, while in intermittent mode, when the action chereduyutsya with a pause, the duration of which is commensurate with the duration of transient processes (if the length is disproportionately large, the process is considered to be, established). The use of pulsed modes of operation has several advantages compared to continuous modes, namely:

1)  in pulse mode, you can get quite impressive power with low average power, and since the dimensions of electronic devices are defined, mainly, average power, the pulsed devices have smaller dimensions, than the device, working in continuous mode;

2) andmpulse of the device almost do not feel the influence of such destabilizing factors as changes in ambient temperature, because working in the key mode: on / off;

3)  pulsed devices have a significant performance and high noise immunity;

4) pulsed devices, even the most complex (for example, computers) constructed from a simple-type elements, which makes extensive use of integrated technology, providing increased reliability and small dimensions;

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5)the use of pulsed (digital) methods in measurement technology have greatly enhanced the accuracy and usability of measuring instruments.

Pulse devices are widely used in the construction of systems of control and regulation for:

1)the formation of pulses necessary forms, duration and polarity with sinusodial oscillations and pulses of another shape;

2)generating pulses with the specified parameters;

3) the control pulses, stand’knitted with the definition of temporary position (delay, sync, account, distribution, etc.).

So: momentum - this momentary change in voltage (current) in elektricnom range from zero to a certain value, the duration of which is comparable or less than the duration of transient processes in this circle.