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An ideal transformer has 10 times more secondary turns than primary turns. What does it do to voltage?

Steps it up 10 times; in an ideal transformer, the voltage ratio equals the turns ratio.

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  1. Steps it down to one tenth
  2. Leaves it the same but raises current
  3. Steps it up 10 times ✔

Why: For an ideal transformer, the secondary to primary voltage ratio equals the turns ratio. Ten times the output voltage means one tenth the output current because ideal input and output power are equal.

Huh, didn't know that: Ideal transformers trade voltage for current: step voltage up 10 times and the current goes down 10 times.

The dad joke
Why did the transformer get promoted? It knew how to step up.
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References

Answer: Steps it up 10 times. For an ideal transformer, the secondary to primary voltage ratio equals the turns ratio. Ten times the output voltage means one tenth the output current because ideal input and output power are equal.

  1. OpenStax College Physics 2e, 23.7 Transformers openstax.org/books/college-physics-2e/pages/23-7-transformers
    the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops in their coils.
    Checked 2026-10-10.

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