电源求助!

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如图1,两个电源,V1和V2,K为继电器,
要做的是,当V1电源接入时,K继电器吸合,
当V1电源断开时,K继器断开.

请大侠帮帮想想办法!!谢谢了!!
很着急!!!

不能说把继电器直接并在V1,那样的话,如图2500) {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/79/2719191247277267.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">

既使V1断开了,K继电器还是会吸合.

求助了,谢谢!!!!