电功率是电学中的重点,也是电学中的难点,电功率有一个基本公式和两个推导公式,许多同学在遇到相关问题时,往往束手无策,不知道应该使用哪个公式,其实求解电功率的问题很有规律性,在绝大多数情况下是用不变的量(如电源电压、电阻),要求的量将已知量表示出来即可,下面就笔者的教学经验,谈谈如何应用电功率的三个公式. Electric power is the focus of electricity, and it is also a difficulty in electricity. Electric power has a basic formula and two derivation formulas. Many students often do not know what to use when they encounter related problems. In fact, the problem of solving electric power is very great. Regularity, in the vast majority of cases, uses constant quantities (such as power supply voltage, resistance), and the required amount can be expressed by the known quantity. The following is the author’s teaching experience, and talks about how to use the three kinds of electric power. formula.