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Is it possible to determine the turns ratio of a step-down transformer with just the following information?

120V (rms) 50 Hz AC mains supply connected to the primary windings. And a secondary voltage of 10V (rms) at the secondary windings output.

Is it a case of simply dividing both rms voltages given by the formula, Vp/Vs = Np/Ns, or do they need to be converted into their peak value?

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The rms value is proportional to the peak value so the ration of $V_p/V_s$ will be the same regardless of if you use two peak values or two rms values.

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  • $\begingroup$ thanks, just noticed that. so, would that calculation in the turns ration or does the formula need manipulating? $\endgroup$ – libraryjoe Oct 21 '16 at 19:58
  • $\begingroup$ The ratio of the voltages is the ratio of the number of turns. $\endgroup$ – M. Enns Oct 21 '16 at 20:01

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