# Fundamental Physics/Electricity/Low frequency filter

 Low frequency filter ${\displaystyle {\frac {v_{o}}{v_{2}}}={\frac {\frac {1}{j\omega C}}{R+{\frac {1}{j\omega C}}}}={\frac {1}{1+j\omega T}}}$ ${\displaystyle T=RC}$ ${\displaystyle \omega _{o}={\frac {1}{T}}={\frac {1}{RC}}}$ Low frequency filter ${\displaystyle {\frac {v_{o}}{v_{2}}}={\frac {R}{R=j\omega L}}={\frac {1}{1+j\omega T}}}$ ${\displaystyle T={\frac {L}{R}}}$ ${\displaystyle \omega _{o}={\frac {1}{T}}={\frac {R}{L}}}$