"Conversion and Conservation of Energy" Utilization of Internal Energy PPT

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"Conversion and Conservation of Energy" Utilization of Internal Energy PPT

Part One Content: Basic Knowledge Key Points

Knowledge point 1: Transformation of energy

1. On April 2, 2018, "Tiangong-1", which has been flying in space for six and a half years, has re-entered the atmosphere. The re-entry area is located in the central South Pacific region, fully completing its historical mission. As shown in the figure, during the process of accelerated fall of "Tiangong-1", mechanical energy is converted into internal energy.

2. Among the following statements about energy conversion, which one is correct (D)

A. Friction generates heat and internal energy is converted into mechanical energy

B. When fuel burns, it generates heat and converts chemical energy into electrical energy.

C. Plants absorb sunlight for photosynthesis, converting light energy into internal energy

D. Electric energy is converted into internal energy when the rice cooker is working

3. The thermal power plant takes in "coal" and produces "electricity". The conversion of energy in this process is (A)

A.Chemical energy→internal energy→mechanical energy→electrical energy

B. Chemical energy → gravitational potential energy → kinetic energy → electrical energy

C. Mechanical energy → Internal energy → Chemical energy → Electrical energy

D. Internal energy → chemical energy → mechanical energy → electrical energy

Knowledge point 2: Law of conservation of energy

4. (Jinan High School Entrance Examination) A large number of studies have shown that energy in nature is conserved. Scientists summarize the results of the research as the law of conservation of energy, that is: energy will neither be destroyed nor created, it will only be generated from one kind Forms are transformed into other forms, or transferred from one object to another, while the total amount of energy remains the same.

5. (Shaoyang High School Entrance Examination) The picture shown is a kind of perpetual motion machine that people imagine. It impacts the blades through the water flow from high places. The rotation of the blades drives the water pump to pump water from low places to high places, thus working in a cycle. This This kind of perpetual motion machine cannot (optional "can" or "cannot") work forever.

6. Regarding the law of conservation of energy, which of the following statements is correct (D)

A. The law of conservation of energy only applies to the mutual conversion of mechanical energy and internal energy.

B. The law of conservation of energy only applies to energy conversion processes

C. "Frictional heat generation" creates heat, which does not comply with the law of conservation of energy.

D. According to the law of conservation of energy, the total energy in the universe will never increase or decrease.

Energy transformation and conservation PPT, part 2: comprehensive ability improvement

7. The Yangtze River Three Gorges power generation unit built in our country converts mechanical energy into electrical energy; the waste incineration power plant converts the internal energy obtained after incineration of waste into electrical energy.

8. The steam catapult used to take off heavy aircraft on traditional aircraft carriers actually generates high-pressure steam from a boiler and stores this high-pressure steam in the steam chamber. Once the steam catapult is started, the power of the aircraft engine plus the steam pressure , the forward thrust of the aircraft can reach a speed of 250 km/h within a distance of 45 m. This catapult converts the internal energy of steam into the mechanical energy of the aircraft; now, people have developed more advanced electromagnetic catapults, and electromagnetic catapults are A strong current is passed through an electromagnet to generate a strong magnetic field, which acts on the tractor connected to the aircraft and is accelerated by the magnetic field force, causing the aircraft to accelerate. This catapult converts electrical energy into mechanical energy for the aircraft.

9. (Wenzhou High School Entrance Examination) A smart blind has solar panels attached to its blades, which generate electricity when exposed to light and supply power to the motor to adjust the opening and closing of the blinds. The energy conversion that occurs during this process is (C)

A. Electrical energy → mechanical energy → light energy

B. Light energy → mechanical energy → electrical energy

C. Light energy → electrical energy → mechanical energy

D. Mechanical energy → Electric energy → Light energy

10. Which of the following phenomena belongs to energy transfer (D)

A. Steel is melted in the furnace

B. Meteors rub against the air and produce heat and light

C. The water vapor in the thermos bottle pushes the cork open

D. Breathing into your hands in winter makes your hands warm.

11. According to the law of conservation of energy, the following situations may occur (B)

A. There is no conversion between energy, the bell sounds

B. The two inclined planes are connected relative to each other. The ball rolls down the left inclined plane and then rushes up the right inclined plane.

C. After the water in the electric kettle boils, the power is cut off, but the water continues to boil.

D. After the bullet from the gun barrel penetrates the wooden board, it continues to move at a faster speed

Energy transformation and conservation PPT, the third part of the content: Expansion of exploration and breakthrough

17. The deceleration process before the EMU train enters the station is divided into two stages: the first stage uses "regenerative braking" technology to reduce the speed from 250 km/h to 90 km/h. During this period, the power supply is stopped and the train relies on inertia. Continue to move forward and drive the generator to generate electricity; in the second stage, mechanical braking is used, and the speed continues to decrease from 90 km/h until it stops. Regarding the energy conversion during the train's arrival at the station, which of the following statements is correct (B)

A. The reduced kinetic energy in the first stage is all converted into electrical energy, that is, the electrical energy is equal to the reduced kinetic energy.

B. Part of the reduced kinetic energy in the first stage is converted into electrical energy, that is, the electrical energy is less than the reduced kinetic energy.

C. The reduced kinetic energy in the second stage is mainly converted into internal energy, and the internal energy is equal to the reduced kinetic energy.

D. The reduced kinetic energy in the second stage is mainly converted into internal energy, and the internal energy is greater than the reduced kinetic energy.

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For more information about the PPT courseware "Utilization of Internal Energy, Transformation and Conservation of Energy", please click on the Utilization of Internal Energy ppt Transformation and Conservation of Energy ppt tag.

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Update Time: 2024-11-21

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