任意子（norator）為電子學中理想的非線性非時變單埠網路，端點之間的電流及電壓可以為任意值。任意子代表增益無限大的電壓源或是電流源[1]。
在電路中加入一個任意子，就可以提供依照基爾霍夫電路定律計算後，電路所需要的電流及電壓。例如理想放大器的輸出就類似任意子，配合電路需求產生需要的電流及電壓。
任意子會和零極子（Nullator，電壓及電流均為零的元件配對，以形成零任偶（Nullor）。
若任意子和零極子並聯，結果類似短路（零電壓，電流為任意值）。若任意子和零極子串聯，結果類似開路（零電流，電壓為任意值）。
延伸閱讀
- P. Kumar and Raj Senani, `Bibliography on nullors and their use in circuit analysis, synthesis and design', Analog Integrated Circuits and Signal Processing, Vol. 33, No.1, pp. 65–76, October 2002.
- Raj Senani, A. K. Singh, Pragati Kumar, R. K. Sharma,`Nullors, Their Bipolar and CMOS Implementations and Applications in Analog Circuit Synthesis and Design', pp. 31–59, Chapter 2 in `Integrated Circuits for Analog Signal Processing', Springer, 2013.
參考資料
外部連結
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