题型:计算题 如图所示电路中,灯泡L标有“6V 3W”字样,滑动变阻器最大阻值R1=12Ω,先闭合S1,将滑动变阻器滑片P滑至左端,此时灯泡L正常发光.问:(1)电源电压是多大?灯泡L正常发光时的电阻是多大?(2)再闭合S2,电流表示数为0.8A,此时R2的电功率是多大?(3)断开S2,当滑片P滑至右端时,灯泡L的实际功率是多大? 查看答案
题型:选择题 ________, Gao Xiaosong was sentenced to 6-month imprisonment-the most severe punishment about drunk driving on June 1. [ ]A. A public figure as is he B. Public figure as he is C. Public figure he is as D. A public figure as he is 查看答案
题型:实验题 小凡同学在做“观察水的沸腾”实验中:(1)他的操作如图15甲所示,其中错误之处是 。(2)纠正错误后,每隔1min测出水的温度,并作出水的温度随时间变化的图像如图15乙所示,则水的沸点为 ℃,水在沸腾过程中温度的特点是 。(3)某实验小组观察到如图15丙、丁所示的两种情景,你认为 图是水沸腾时的情景。(4)为了减少从开始加热到沸腾的时间,可以采取哪些措施:(写出两点)① ,② 。 查看答案