Changing magnetic flux moves energy from one winding to another without the two being connected, and the turns ratio sets the voltage relationship.
It is how the voltage on a site gets to be whatever it is, and the word "ideal" in the formula is doing more work than most people notice.
An ideal 2:1 step-down takes 120 V AC to 60 V AC: twice the turns on the primary, half the voltage on the secondary. Ideal means the relationship before losses and before any limit the actual device carries. A real transformer has ratings, and the ratio tells you nothing about whether this one may be used in this application.
Check yourself: A 2:1 transformer will give you the voltage you need. Is it suitable?
Answer: Not established. Ratings and application limits still apply.
The turns ratio answers what the voltage relationship is. Whether the device may be used here is a separate question answered by its ratings and the application, and a correct ratio on an unsuitable device is still unsuitable.
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Written from the owner's poster for this lesson. Nothing added beyond what the poster states.
Written for Texas apprentices as free study material. The Texas apprentice licence is an application, not an exam (Occupations Code 1305.161), and nothing here counts as apprenticeship hours or continuing-education credit. VoltMark is not affiliated with, endorsed by, or sponsored by NFPA, PSI, TDLR, or any state or local licensing authority. Always follow your employer's safety programme and your supervising electrician.
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