灯光渐亮,音乐渐起,幽静的湖畔,朦胧的月色,一群美丽的白天鹅出现在舞台上,随着灯光的变化,翩翩起舞……多么美丽的《天鹅湖》!也许你没想到,舞台灯光强弱和声音大小的控制都是通过改变电流大小来实现的.那么哪些因素能影响电流的大小呢?如图1所示,闭合开关后,小灯泡在使用两节干 The light is getting brighter, the music is getting fiercer, the quiet lakeside, the dim moonlight, a group of beautiful white swans appear on the stage, with the change of light, dancing ... What a beautiful “Swan Lake”! Maybe you did not expect, Stage lighting intensity and the size of the sound control by changing the size of the current to achieve. So what factors can affect the current size? As shown in Figure 1, closed the switch, the small bulb in the use of two dry