Question

以下是“描繪小燈泡的伏安特性曲線”實驗的操作步驟：                                               

A．閉合電鍵，記下電流表、電壓表的一組示數（I，U），移動變阻器的滑動觸頭位置，每移動一次記下一組（I，U）值，共測出12組左右的數據．                                                                                          

B．將電流表、電壓表、變阻器、電燈、電源開關正確連成電路，電流表外接，變阻器采用分壓式，如圖所示                                                                                                                                        

C．調節(jié)觸頭位置，使閉合電鍵前觸頭處于變阻器的左端．                                        

D．按所測數據，在坐標紙上描點并將各點用直線段連結起來，得出小燈泡的伏安特性曲線．                                                                                                                                         

（1）以上各步驟中存在錯誤或不妥之處的是                                            ，應如何改正                 ？                        

（2）將步驟糾正后，按實驗先后順序排列起來                          ．                             

                                                                                                         

                                                                                                                                  

Answer 1

（1）C有錯，滑片應滑到右側；D有錯，應為按所測數據，在坐標紙上描點并將各點用一條平滑的曲線連接起來．（2）BCAD