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SESK: Stuff Everyone Should Know · sesk.info/hame-half-power-point

At the half-power points of a resonant circuit, the current is what fraction of its maximum?

0.707, because power goes as current squared.

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  1. 0.5
  2. 0.25
  3. About 0.707 ✔

Why: The 0.707 current points correspond to the half-power points. Power scales with the square of the current, so 0.707 squared gives one half.

Huh, didn't know that: In the source example, a 50 mA peak current means the half-power points sit at 35.4 mA.

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What do electricians chant when they meditate? Ohm.
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References

Answer: About 0.707. The 0.707 current points correspond to the half-power points. Power scales with the square of the current, so 0.707 squared gives one half.

  1. Workforce LibreTexts, 6.06 Q Factor and Bandwidth of a Resonant Circuit workforce.libretexts.org/Bookshelves/Electronics_Technology/Electric_Circuits_II_-_Alternating_Current_(Kuphaldt)/06%3A_Resonance/6.06%3A_Q_Factor_and_Bandwidth_of_a_Resonant_Circuit
    The 0.707 current points correspond to the half power points
    Checked 2026-10-10.

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