版选修3_1.ppt

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第二章 恒定电流,【体系构建】,【核心速填】 1.基本概念: (1)电流。 定义式:I=_。 微观表达式:I=_。 方向:与_移动方向相同。,nSve,正电荷定向,(2)电压。 定义式:U=_。 计算式:U=_。 (3)电阻。 定义式:R=_。 决定式:R=_。 (4)电动势:E=_。,IR,2.基本规律: (1)电阻定律:R=_。 (2)欧姆定律。 部分电路欧姆定律:I=_。 闭合电路欧姆定律:I=_。,(3)电功和电热。 电功:W=_=_。 电热(焦耳定律):Q=_。 (4)电功率。 纯电阻:P=_=_= 。,qU,UIt,I2Rt,UI,I2R,电源。 a.总功率:P总=_。 b.发热功率:P热=_。 c.输出功率:P出=_。 d.关系:P总=_。,EI,I2r,UI,P出+P热,

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