一、前言在直流电路中,电源的电动势和内电阻通常是常量,随着外电阻的变化,路端电压,电流强度,输出功率和电源的效率也发生一系列变化,认识这些变化,对掌握直流电路的规律是十分重要的。本文所列程序(见程序1,2)就是为这一目的而设计的,它能使由键盘输入的16个外电阻的值,按从小 I. Introduction In the DC circuit, the power of the electromotive force and the internal resistance is usually constant, with the external resistance changes, the road voltage, current strength, output power and power efficiency also occurred a series of changes, understanding of these changes, to master The law of the DC circuit is very important. The procedures listed in this document (see Procedures 1 and 2) are designed for this purpose and enable the value of the 16 external resistors input by the keyboard to be small