# Tag Info

First, the formula as written isn't dimensionally consistent and so, cannot be correct. The correct formula$^1$ is $$\frac{V_p}{I_p}= \sqrt{R^2_{coil} + (2\pi f L)^2 }$$ Now, this formula assumes sinusoidal (AC) voltage and current. Given a frequency $f$, the peak voltage across and peak current through are related by this formula. Ordinarily, to test ...