RLCの直列共振回路

$\displaystyle v$	$\textstyle =$	$\displaystyle iR + \frac{q}{C} + L\frac{{di}}{{dt}}$	(34)
$\displaystyle vi$	$\textstyle =$	$\displaystyle i^2 R + \frac{q}{C}\frac{{dq}}{{dt}} + Li\frac{{di}}{{dt}}$	(35)
$\displaystyle vi$	$\textstyle =$	$\displaystyle i^2 R + \frac{d}{{dt}}\left( {\frac{{q^2 }}{{2C}}} \right) + \frac{d}{{dt}}\left( {\frac{L}{2}i^2 } \right)$	(36)