电子学基础/电阻网络

并联电阻

${\frac {1}{R_{t}}}={\frac {1}{R_{1}}}+{\frac {1}{R_{2}}}+....+{\frac {1}{R_{n}}}$

分压器

${\frac {v_{o}}{v_{i}}}={\frac {R_{2}}{R_{2}+R_{1}}}$

分流器

π 形网络

${\frac {v_{o}}{v_{i}}}={\frac {R_{3}+R_{2}}{R_{1}+R_{2}}}$

T 形网络

${\frac {v_{o}}{v_{i}}}={\frac {R_{3}}{R_{1}}}({\frac {R_{3}-R_{2}}{R_{1}-R_{2}}})$

维恩桥网络