1.，P=UI=3.7Vx0.4A=1.48W,W=Pt=1.48Wx5x60s=444J,2.，W=Pt=UxIxt=3.7vx1.2Ax3600s=15984J3，t=W/P=15984J/1.48W=10800s=3h还有不懂的欢迎追问
300. 48000. 3
