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在学习闭合电路的欧姆定律时,推导出一个重要的结论,Pm=ε2/4r,正确理解并灵活运用此结论,在解决实际问题过程中,起着重要的作用.
When learning the Ohm’s law of the closed circuit, an important conclusion was deduced, Pm=ε2/4r. Correct understanding and flexible use of this conclusion play an important role in solving practical problems.