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What is the total resistance of 10-, 20-, and 50-ohm resistors connected in parallel?

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  1. 5.9 ohms
  2. 17 ohms
  3. 80 ohms

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References

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf Checked 2026-10-11.
  2. Resistors in Series and Parallel (OpenStax University Physics via LibreTexts) phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)/10%3A_Direct-Current_Circuits/10.03%3A_Resistors_in_Series_and_Parallel Checked 2026-10-11.

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