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从能量观点看,电源与用电器均为换能器件。在某些情况下,二者是可逆的。蓄电池就是典型的代表之一,它接入电路中,是充当电源抑或用电器,可依据电路中电流的流向进行判断,若电流与电动势方向一致,即为电源注,反之即为用电器(此时其电动势称为反电动势)。在总复习时,指导学生将其有关内容进行归纳、对比并总结一些规律,这对帮助他们系统地掌握和灵活地运用知识
From an energy point of view, power supplies and consumer electronics are transducing devices. In some cases, both are reversible. The battery is one of the typical representatives. It is connected to the circuit and acts as a power supply or an electrical appliance. It can be judged based on the current flow in the circuit. If the current is the same as the direction of the electromotive force, it is the power supply note, and vice versa. Its electromotive force is called back EMF. During the overall review, students are guided to summarize, compare, and summarize some of their relevant content. This helps them systematically and flexibly use knowledge.