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Primary and Secondary Voltages In A Transformer |
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| May4-05, 07:45 PM | #1 |
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Primary and Secondary Voltages In A Transformer
Hi!
I just got to my last homework question and am not quite sure how to figure it out, it goes like this: Scott connects a transformer to a 24V source and measures 8.0V at the secondary. If the primary and secondary were reversed, what would the new output voltage be? I'm not sure how to go about this. I know the basic ratios like Np/ns = Vp/Vs = Is/Ip but I can't think of how to do this question. I'm sure it's super easy but I'm super dumb Thanks for any help in advance!
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| May4-05, 08:06 PM | #2 |
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Hint: If the transformer steps down the voltage when used one way, then what must it do if the primary and secondary are reversed?
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| May4-05, 08:17 PM | #3 |
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If they are reversed the voltage must step up, but I still don't see how to answer the question :(
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| May4-05, 08:30 PM | #4 |
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Primary and Secondary Voltages In A Transformer
The input voltage doesn't change. It's still 24V.
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| May4-05, 08:35 PM | #5 |
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Would the new voltage be
24/8 = 8/x x = 2.7V? |
| May4-05, 08:39 PM | #6 |
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Not even close.
Remember: When used one way, the transformer steps down the voltage by a certain ratio (what is that factor?). So... when used in reverse, it will step up the voltage by the same factor.
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| May4-05, 08:52 PM | #7 |
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Um ok, so originally you have 24/8, and now we are stepping it up by that factor (3). So now we end up with the original 24v x 3 which equals 72v?
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