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有关电功率的计算问题,既是初中物理的重点之一,又是一个难点,解有关电功率的计算问题时,不仅要综合运用有关的物理知识(主要是指欧姆定律、串并联电路特点,以及电功的知识等),而且还要涉及到一些“额定”与“实际”的问题(主要是指“额定电压”、“额定功率”、“额定电流”和“实际电压”、“实际功率”、“实际电流”等)。为了帮助同学们突破这个难点,本文结合具体实例,对如何解此类问题进行探讨。
The calculation of electric power is not only one of the focuses of junior high school physics, but also a difficult point. When solving the calculation problem of electric power, it is necessary not only to comprehensively use relevant physical knowledge (mainly referring to Ohm’s law, characteristics of series-parallel circuits, and electric power. Knowledge, etc., but also related to some “rated” and “real” issues (mainly refers to “rated voltage”, “rated power”, “rated current” and “actual voltage”, “actual power”, " Actual current, etc.). In order to help students break through this difficult point, this article combines specific examples to discuss how to solve such problems.