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一、知道直流电动机的原理例1（’96贵阳）直流电动机是利用____在____里受力转动的原理制成的．（’96昆明）它是把___能转化为_______能．答通电线圈，磁场．电，机械．二、会画实验电路图例2（’96成都）把电动机、开关S，滑动变阻器R，电池组成实验电路图．答电路图如图1所
First, know the principle of DC motor Example 1 (’96 Guiyang) DC motor is made using the principle of ____ force rotation in ____. (’96 Kunming) It is a ___ can be converted to _____. Answer energizing coil, magnetic field. Electricity, machinery. Second, will draw the experimental circuit example 2 (’96 Chengdu) to the motor, switch S, sliding rheostat R, battery circuit composition experiment. Answer the circuit diagram shown in Figure 1.