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电功率是初中电学最重要的知识点,掌握这部分知识,不但可以巩固前面的旧知识,还可以在以后的学习中受益,电功率是反映用电器做功快慢的物理量,它等于电压与电流的乘积。不同的用电器标有不同的电功率,各种用电器上标着的电压值是用电器正常工作的电压叫额定电压,用电器上标的功率是用电器在额定电压工作时的电功率,叫额定功率,用电器未在额定电压下工作时的功率,叫实际功率.在求实际功率时,可根据P实=U实I实来计算,
Electric power is the most important knowledge point for junior high school electricity. Mastering this part of knowledge can not only consolidate the old knowledge, but also benefit from future learning. Electric power is the physical quantity that reflects the power of electrical appliances. It is equal to the product of voltage and current. Different electric appliances are marked with different electric power. The voltage value of various electric appliances is the nominal voltage of the electric appliance. The rated electric voltage is the nominal voltage of the electric appliance. The electric power of the electric appliance is the rated electric power when the electric appliance is working at the rated voltage. The power when the appliance is not operating at the rated voltage is called the actual power. When the actual power is calculated, it can be calculated based on the actual value of P = U.