High School Physics Gravitational Potential Energy

Introduction Selection of gravitational potential energy from high school physics bc The height of the center of gravity of the water in the upstream reservoir used for electricity generation from the downstream horizontal plane is H-d/2, so the energy maximum gravita

High School Physics Gravitational Potential Energy

Select bc. The height of the center of gravity of the water in the upstream reservoir used for electricity production from the downstream horizontal plane is H-d/2, therefore the maximum gravitational potential energy of the water used for electricity production electricity Ep = density. * Vg (H-d/2), so b has a negative impact on the power plant. Total efficiency

=1.8*10^8/(2.4*10^8)=75%, so it is true.

And because W=pt, therefore

t =1.8*10^8/10^5=1.8*10^3h

So t per day = 1.8*10^3/365 The result is approximately equal to 5h, so d is false

Raindrops The difference in altitude is greater than that of the Three Gorges Dam. Can it be used to generate electricity?

You can build a dam 120 meters high. Of course, the embankments on both sides of the river should be raised accordingly according to the actual situation to ensure that your power station has a 100 meter dams high. high water height.

According to your description, the water volume of the large canal is 2*3*0.7*0.5=2.1m^3/s (due to the shear force of the 'water, the water flow speed at the bottom cannot reach 0.7 m/s, due to the lack of parameters, it is difficult to calculate, so let's take it as half). Then the water storage capacity per day is 362,880 cubic meters. I suggest you be more aggressive and choose a 700MW hydroelectric generator currently widely used in large hydropower projects in China. Use a water diversion steel pipe with an inner diameter of 12.3 meters. the flow rate is approximately more than 900 cubic meters/second.

To produce electricity for 1 hour, it takes approximately 900/2.1=428 hours=18 days to store water.

The quantity of water circulating through the turbogenerator during this period is 900*3600=3240000 cubic meters

The quantityity of water circulating through the canal is relatively negligible.

If you want to produce electricity, you must maintain a high water level. It is recommended that it be greater than 80 meters. Then the reservoir area of ​​your hydropower plant must be greater than 3240000/(100. -80)=162,000 square meters

p>

Therefore, the river embankments along the coast must be built far enough to ensure that the headwaters will not be threatened when the water storage height is 100 meters.

Then after 18 days of water storage, you can open the portal to release water to generate electricity for 1 hour, then close the portal.

Since you have such awesome power generation equipment, you no longer need to sell electricity to power plants. You can connect it directly to the national network and purchase it forChina Power.

Power plants can produce electricity because generators can convert other forms of energy into electrical energy. Hydroelectric power plants rely on the gravitational potential energy of water to produce electricity. The drop in the Three Gorges Power Station is approximately 113 meters. When water falls from such a high position, much of the reduced gravitational potential energy is converted into electrical energy.

Raindrops fall from the sky, and the height of the fall is generally more than a few hundred meters, and some will fall thousands of meters. Is it possible to produce electricity by relying on falling raindrops? You can think of the joke that a group of doctors calculate the falling speed of raindrops. If it is calculated according to the free fall movement, the vitesse of raindrops when they fall on the ground is 1000.The degree is huge. For example, if you fall to the ground from a height of 1,000 meters, the speed will reach 140 meters per second, which is enough to harm people. But in fact, people caught in the rain will not feel hurt by raindrops, because the speed at which raindrops fall on the ground is not very fast at all. The speed of raindrops falling to the ground is related to the mass of the raindrops. The speed of small-mass raindrops reaching the ground is less than 1 meter per second, and the speed of large-mass raindrops generally does not exceed 10 meters per second. second. Most of the mechanical energy of the raindrops has been converted to internal energy by friction with the air in the air, and there is not much mechanical energy left in the raindrops.

Most ofof the mechanical energy of the raindrops is converted into internal energy. Isn't it possible to use internal energy to produce electricity? Thermal power plants use the thermal energy released by burning coal to drive the rotor and then convert the mechanical energy into electrical energy. However, thermal power plants need heat engines capable of converting internal energy into mechanical energy. Internal energy is difficult to use because it involves directionality of energy conversion. Mechanical energy can be easily converted into internal energy, but internal energy cannot be easily converted into mechanical energy. The conversion rate of internal energy into mechanical energy will never reach 100% and is related to the temperature of the high temperature heat source and the low temperature heat source. Like raindrops falling from high altitude, their ctemperature changes are very small. It is not worth installing a thermal machine between the sky and the earth to convert the internal energy of raindrops into mechanical energy and then into electrical energy.

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