Question
Military aircraft use 400-Hz AC power, because it is possible to design lighter-weight equipment at this higher frequency. What is the time for one complete cycle of this power?

$3.00 \textrm{ ms}$

Solution Video

OpenStax College Physics Solution, Chapter 20, Problem 75 (Problems & Exercises) (0:19)

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Video Transcript
This is College Physics Answers with Shaun Dychko. The period of AC current in military aircraft is going to be the reciprocal of the frequency. So that's one over 400 Hertz which is 0.003 seconds or 3.00 milliseconds.