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Duty cycle

(percent of time when activity is recurring)

A Duty Cycle is a percentage of time over a period when something is active or engaged, in particular, when the activity recurs. An electrical device might be active only 1/10 of each second, i.e., 10% with a period of 1 second.

The term has been used to help describe periodic phenomena in science, e.g., astrophysics, in which it might be used in describing Active Galaxy activity.