- An instantaneous current or voltage increase of great magnitude, such as that cause by a lightning strike or when power is restored after a blackout. A spike can arrive via power lines, phone lines, network lines, or the like, and may cause extensive damage if protective measures are not taken.
- An very short pulse superimposed on a pulse of longer duration.
- A spike (1) or spike (2) as displayed on a oscilloscope or other monitor, a printed plot, such as that of an EEG, and so on.
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