如9v800豪安1小时：
9V*0.8A=7.2W,7.2w*1H=7.2WH,7.2WH/1000WH=0.0072KWH(度）
如12V1000MA1小时：
12V*1A*1H/1000WH=0.012KWH=0.012(度)
1度=1000KWH
1A=1000MA