电路的输入阻抗（）是指电路从输入功率源方向“看进”电路时所等效的阻抗。如果功率源提供了已知的电压和电流，这阻抗可以通过欧姆定律求得。输入阻抗是电路的戴维寧等效，其模型是一个RL（电阻-电感）或RC（电阻-电容）组合，得到的等效电路能与原电路对外产生相同的响应效果。
外部链接
*[http://www.sengpielaudio.com/calculator-bridging.htm Calculation of the damping factor and the damping of impedance bridging]
*[http://www.sengpielaudio.com/calculator-voltagebridging.htm Interconnection of two audio units - Input impedance and output impedance]
*[http://www.kpsec.freeuk.com/imped.htm Impedance and Reactance]
*[http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm Input Impedance Measurement]
参考文献
*The Art of Electronics, Winfield Hill, Paul Horowitz, Cambridge University Press, ISBN 0-521-37095-7
*"Aortic input impedance in normal man: relationship to pressure wave forms", JP Murgo, N Westerhof, JP Giolma, SA Altobelli [http://circ.ahajournals.org/cgi/reprint/62/1/105.pdf pdf]
An excellent introduction to the importance of impedance and impedance matching can be found in A practical introduction to electronic circuits*, M H Jones, Cambridge University Press, ISBN 0-521-31312-0
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