菜鸟问题

andiy

请问阴极电压高于阴极与灯丝击穿电压时,有中心抽头时如何抬高灯丝电压?没抽头时又如何?详细说明有图最好!

andiy

Julien

原理是两分压电阻可以看作串连，并且没有其他支路，所以电流相同，根据欧姆定律，化简可得上面的结论

andiy

但是灯丝一端接引入的高压需经分压电阻,分压电阻阻值如何计算呢?<img src="attachments/dvbbs/2005-7/20057711144568.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-7/20057711144568.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Julien

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