By 20 15, the largest pumped storage power station in Jiangsu Province will be built in Liyang. The working principle of pumped storage power station is: when the electricity consumption is low, the p

By 20 15, the largest pumped storage power station in Jiangsu Province will be built in Liyang. The working principle of pumped storage power station is: when the electricity consumption is low, the power station uses the power grid. (1) As shown in the figure, the left highland is relatively high. After the reservoir is filled with water, the gravitational potential energy stored in the water is more, and when it flows downward, it converts more kinetic energy, thus converting more electric energy. Among them, the hydro-generator is made according to the electromagnetic induction phenomenon discovered by the British scientist Faraday;

(2) The vertical height of the two lines is the same, but the distance between AB and CD is larger, because the longer the slope (the smaller the slope), the more labor will be saved, so it will be more labor-saving to choose the CD line to go up the mountain;

(3)h=900m=400m=500m

g = mg =ρVG = 1× 10 3kg/m3×2.5× 10 7 m3× 10N/kg = 2.5× 10 1 1n，

w = Gh = 2.5× 10 1 1n×500m = 1.25× 10 14j；

(4) The construction of pumped storage power station can reduce coal consumption and improve thermal power utilization efficiency.

So the answer is: (1) gravity potential, electromagnetic induction; (2) CD; (3) 1.25× 10 14 ; (4) Reduce the coal consumption of thermal power and improve the utilization efficiency of thermal power.