1998年全国初中物理知识竞赛第五大题是这样的:有一个瀑布,每分钟有60米~3的水从50米高处落下,想利用它建设小水电站.若水的机械能有70%转化为电能,送电电压为10000伏特,导线上的电流是多少?(g=10牛/千克) The fifth major issue of the 1998 National Junior Physics Physics Knowledge Contest was this: There is a waterfall, 60 meters to 3 meters of water per minute fall from a height of 50 meters, would like to use it to build a small hydropower station. If the water mechanical energy has 70% conversion Electricity, power supply voltage is 10000 volts, what is the current on the wire? (g=10 N/kg)