电功和电功率是初中教师教学的重点之一 ,也是同学们学习的难点。怎样分析、计算电路的实际功率呢 ?一、弄清额定功率与实际功率的含义用电器上的功率值和电压值分别叫做用电器的额定功率和额定电压 ,用电器只有在额定电压下的输出功率才是额定功率 ,额定功率的大小反映用电器 Electrical power and electric power are one of the focuses of junior high school teachers’ teaching and are difficult for students to learn. How to analyze and calculate the actual power of the circuit? First, find out the meaning of the rated power and the actual power. The power value and voltage value on the electrical appliance are respectively called the rated power and rated voltage of the appliance, and the output of the appliance is only at the rated voltage. The power is the rated power, and the rated power reflects the use of electrical appliances