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电源输出功率是闭合电路欧姆定律考查的重要内容,其表达形式多样,单纯用数学方法寻求表达式并讨论其变化规律时较为抽象,且
The output power of the power supply is an important part of the investigation of the Ohm’s law of the closed circuit. Its expression is various. It is more abstract to use mathematical methods to seek expressions and discuss its changing rules.