山东省泰安市岱岳区新城实验中学2015中考物理第一轮复习学案:电功率(无答案)
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资料简介
一、目标锁定
1.知道电流做功的过程是电能转化成其他形式能的过程,会使用电能表测电功.
2.知道电功率的物理意义、定义和单位,会用相关公式进行简单的计算.
3.理解额定功率和实际功率的意义.
4.会用焦耳定律进行简单的计算.
5.会用电流表和电压表测量小灯泡的电功率.二、自主学习?导航
考点1 电功
1.电流做功的过程,也就是电能转化成 能的过程.电功的国际主单位是 ,常用单位是 ,两单位间的换算关系是 .
2.计算电功常用的公式是 .
考点2 电功率
1.物理意义:表示电流做功的 .
2.定义:电流 时间内所做的 .
3.公式:计算电功率的基本公式是P= _ ,结合欧姆定律,还可得出P= ____ 和P= _ .
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资料作者:新城实验中学
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