电能表是电学中非常重要的测量仪表 ,它和电流表、电压表一样 ,在实验电路中发挥着自己特殊的作用。我们可以透过电能表 ,展开“电功、电功率及家庭电路”这一部分初三物理难点的全面复习。纲要如下 :1　测量 :电功→引出 概念表示电流做功的多少及做功的实质。电流做了多少功 Electric energy meter is a very important measuring instrument in electricity. It is the same as ammeter and voltmeter and plays its own special role in the experimental circuit. We can carry out a comprehensive review of the physics difficulties of the third grade of “electric power, electric power and home circuit” through the electric energy meter. The outline is as follows: 1 Measure: Electric work→extraction The concept shows how much work is done in current and the essence of doing work. How much current does the work