近日在教学过程中遇到一道题,题目如下:小灯泡通电后,其电流I随所加电压U的变化的图线如图1所示,P为图线上一点,PN为图线在P点的切线,PQ为U轴的垂线,PM为I轴的垂线,则对应P电小灯泡 Recently encountered a problem in the teaching process, the title is as follows: After the light bulb is energized, the current I with the applied voltage U changes graph shown in Figure 1, P is a point on the map line, PN for the graph at the P point Of the tangent, PQ for the U-axis vertical, PM I-axis vertical line, the corresponding P electric light bulb