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電阻

出自維基百科,自由嘅百科全書
  提示:呢篇文講嘅唔係電阻器

電阻(Resistance,符號:R,又叫電阻值,以同簡稱「電阻」嘅電阻器區分)係導體嘅一種性質,表示導體對電流嘅阻礙能力。根據歐姆定律(Ohm's Law),,即係假設溫度不變嘅情況下,當電阻固定嗰陣,電流嘅大細同電壓成正比;當電壓固定嗰陣,電流嘅大細同電阻嘅大細成反比。

電阻值嘅國際單位歐姆(ohm,符號:Ω),簡稱歐。如果有 1 安培電流流過導體嗰陣,導體兩極嘅降壓係 1 伏特,噉件導體嘅電阻值就係 1 歐姆

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