题目

    On one summer night, Henry was sleeping in his room            1._______when suddenly he woke up and sensed that something                2._______unusual. He looked out of the window and finding a                   3.________store nearby on the street was in fire. He immeditately                4._______shouts at the top of his voice “Fire! Fire! Help!” He                    5. _______phoned 119 at once and then went out to put out fire.                 6. _______but it was very big a fire(10分)如图所示，电源电动势为E=30V，内阻为r=1Ω，电灯上标有“6V，12W”字样，直流电动机线圈电阻R=2Ω。若闭合开关后，电灯恰能正常发光，求：（1）流过电灯的电流是多大？（2）电动机两端的电压是多大？（3）电动机输出的机械功率是多少？