欧姆定律2
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资源概述与简介：
欧姆定律（2）串联和并联电路电阻的特点
教学目标
掌握串联和并联电路电阻的特点并能灵活运用
教学进程： 串联电路电阻特点
同学们一定还记得串联电路中，电流和电压的规律，
能不能再利用欧姆定律分析串联电路中电阻的规律呢？
串联电路
请同学们写出串联电路中电流、电压的规律和欧姆定律.
电压规律：文字： 公式 电流规律：文字： 公式 欧姆定律： 变形式 和
对R1：I1=；对R2：I2= 变形后得U1=I1R1，U2=I2R2，U=IR，
代入电压规律得：IR=I1R1+I2R2.
由于电流规律：I=I1=I2，所以R=R1+R2.
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