论文部分内容阅读
中考刚过,中考试题成为人们议论的热门话题.现就黄冈市2002年中考物理压轴题谈谈个人的浅见.题目 HG2002型台式饮水机在热胆中储水,由电热管加热,饮水机的电路如图甲所示,水沸腾前,红灯亮,绿灯灭,加热管正常工作;水沸腾后,绿灯亮,红灯灭,加热管不正常工作.试分析温控开关1和2在水沸腾前、后的通断情况以及红、绿指示灯电阻 R_红和 R_绿应满足的条
After the middle school exam was passed, the examination questions became a hot topic for people to discuss. Now we will talk about the personal views of the personal physical pressure problem in the 2002 middle school entrance examination in Huanggang City. Title HG2002 desktop drinking machine stores water in a hot bile, heated by electric heating pipes, and drinking fountains The circuit is shown in Figure A. Before the water is boiled, the red light is on, the green light is off and the heating tube is working normally. After the water boils, the green light is on, the red light is off, and the heating tube is not working. Try to analyze the temperature control switches 1 and 2 in the water. The on-off condition before and after boiling, and the red, green indicator resistance R_red and R_green should satisfy the bar