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最简单的直流电路如图1所示,闭合电路欧姆定律的基本形式是 I=ε/(R+r) ①当电源电动势ε和它的内电阻r恒定时,图1中的电流强度I,是负载电阻R的单值函数。由①式变形可得 U=ε-rI′ ②
The simplest DC circuit is shown in Fig. 1. The basic form of the closed circuit Ohm’s law is I=ε/(R+r) 1 When the power emf and its internal resistance r are constant, the current intensity I in Figure 1, It is a single-valued function of the load resistance R. U=ε-rI′ 2