Core Turns
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Turns per volt

TPV = 1 / (4.44 * f * Bmax * Ac * 10^-4). Ac is cm2 and Bmax is tesla.

Np = Vp * TPV. Ns = Vs * TPV * (1 + regulation). The form defaults to percent: 5 means 5%. Fraction 0.05 is the same value.