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What is the ratio for the windings of a 120 volt to 24 volt step down transformer?

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kdsjr123
kdsjr123 Member Posts: 1
What is the ratio for the windings of a 120 volt to 24 volt step down transformer?

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  • Jamie Hall
    Jamie Hall Member Posts: 23,426
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    Say what? Are you planning on making one? The unloaded voltage produced by a transformer is proportional to the ratio of turns -- so for a 120 to 24 it's 5 to 1. The measured output voltage under load may not be that, however.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Solid_Fuel_Man
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Sounds like a question from a class/school?

    There was an error rendering this rich post.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,613
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    The ratio is the same as the voltage change so 120 turns primary and 24 secondary 120/24=5 so it's a 5-1 ratio as @Jamie Hall mentioned.

    208 volt to 120 volt would be 208/120=1.73 so 1.73-1 ratio

    480 volt to 120 volt would be 480/120=4 so 4-1 ratio

    We only know the ratio. If you need the exact #s yould have to call a transformer mfg