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## Main Question or Discussion Point

I would like to know how to work out the turn ratio on a transformer from having just the input and output voltages.

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- Thread starter speedy46
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- #1

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I would like to know how to work out the turn ratio on a transformer from having just the input and output voltages.

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- #2

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N = turns ratio

Vp = primary Voltage (rms)

Vs = secondary Voltage (rms)

In real transformers, the turns ratio will be slightly higher (typically about 2%) than what is calculated by this formula. One way to improve the accuracy of the calculation is to use a primary Voltage that is only about 10% of the rated Voltage.

- #3

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For example = 244 / 9.88 = 24.6

So the turn ratio is 24 - 6

So the turn ratio is 24 - 6

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- #4

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- #5

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what? isn't it 246 to 10? or 24.6 to 1?For example = 244 / 9.88 = 24.6

So the turn ratio is 24 - 6

- #6

stewartcs

Science Advisor

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There are quite a few more types of transformers than just step-up and step-down (e.g. autotransformers, buck-boost, isolation).

CS

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How do you calculate the out put voltage of a transformer when you only know the input voltage

- #8

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its based on the ratio as stated

How do you calculate the out put voltage of a transformer when you only know the input voltage

- #9

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Is there a formula for working this out please

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- #11

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- #12

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thank you

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