高中课本物理学第三册中关于欧姆定律的叙述是这样的:“这个定律表示出电流强度跟电压和电阻的关系:导线上的电流强度跟这段导线上的电压成正比,跟这段导线的电阻成反比。”写成公式,就是 I=V/R.“这里研究的欧姆定律,是对某段导线讲的,也就是对部分电路讲的,所以叫做部分电路的欧姆定律。”(见课本第26节)。 The account of Ohm’s law in High School Textbook Physics Volume 3 is this: “This law shows the relationship between current intensity and voltage and resistance: The current intensity on a wire is proportional to the voltage on this wire, and this The resistance of the wire is inversely proportional.”Writing formula, is I = V/R.“ Ohm’s law studied here is to talk about a certain section of wire, that is to speak of part of the circuit, so called part of the Ohm’s law. ”(See lesson 26).