九年级物理全册第十九章生活用电章末小结与提升练习(新版)新人教版.doc

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1第十九章 生活用电章末小结与提升保险丝、两孔插座、三孔插座和螺口灯泡的连接元件 连接保险丝 一般装在火线上两孔插座 “左零右火”三孔插座 “左零右火上接地”螺口灯泡“火线零线并排走,零线直接进灯座(接螺旋套),火线先进保险盒,再过开关进灯座(接灯泡尾部)”典例 图甲是某宾馆床头柜上的开关示意图,图乙是其控制的电路,其中 S1为旋钮开关,单独控制台灯的通断和亮度;S 2为单独控制电视插座的开关。请在图乙中将电路图连接完整,要求符合安全用电原则。2【解析】火线先进开关 S1,然后接入灯泡;而零线直接接入灯泡;由题意可知,开关 S2应与插座串联,此时开关 S2应接在火线和电视插座下端之间,电视插座上端直接接零线。【答案】 如图所示

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