Turunan rumus impedansi total rangkaian seri RLC dan frekuensi resonansinya

V = √[VR² + (VL - VC)²]
iZ = √[(iR)² + (iXL - iXC)²]
Z = √[R² + (XL - XC)²]

XL = XC
2πfL = 1 / (2πfC)
1 = 4π²f²LC
f = 1 / [2π√(LC)]
  = 1 / (2π) √[1 / (LC)]