電器 (Tiān-khì)阻抗 (chó͘-khòng) (電氣阻抗，electrical impedance) 嘛 (mā)簡稱 (kán-chheng)做 (chò)阻抗 (impedance)，是 (sī)用 (ēng)來 (lâi)讀 (tō͘)看 (khoàⁿ)阻擋 (chó͘-tòng)正弦 (chiàⁿ-hiân) (sinusoidal) 電流 (tiān-liû) (electric current) 的 (ê)力量 (le̍k-liōng)有 (ū)偌 (joā)強 (kiông)。阻抗的觀念 (koan-liām)就 (tō)是共 (kā)Ohm定律 (tēng-lu̍t)擴充 (khok-chhiong)，用佇 (tī)AC電路 (tiān-lō͘)分析 (hun-sek)。電路 (electric circuit) 的阻抗會當 (ē-tàng)是複雜數 (ho̍k-cha̍p-sò͘)，這 (che)佮 (kap)電阻 (tiān-chó͘) (electrical resistance) 無 (bô)仝 (kâng)。1886年 (nî)7--月 (goe̍h)Oliver Heaviside創造 (chhòng-chō)阻抗這 (chit)个 (ê)術語 (su̍t-gí)。
