A sudden, momentary change in voltage or current from an otherwise steady (or slowly varying) value. (More commonly pulse.)

The occurrence of surges in an electric current; also, a surge.

transferred in reference to various physical things, as fire, wind, sound; also to ‘rolling’ or undulating hills or the like.

transferred. A jerk, jolt; jerking motion. Hence, a pulse or surge of electricity capable of producing a jerk in a detecting or measuring instrument…

Physics and Electronics. A sudden momentary change in the amplitude of an electrical signal from a steady or slowly varying level; = impulse, n. 5.

A surge of current or a spurious electrical signal (see quots.); also, in extended use, a sudden short-lived irregularity in behaviour.