500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/34/1129619034.gif');}" onmousewheel="return imgzoom(this);">双电源电流问题(图)
根据图中,理论上来说我调节Rg就可以在负载上通过不同电流大小的电流值,可是实际测试时发现电流超过3.2安培左右时电流表上读书就突然变小为零,请各为指点一二
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