"Conversion and Conservation of Energy" Energy, Materials and Society PPT Courseware

"Conversion and Conservation of Energy" Energy, Materials and Society PPT Courseware

1. Various forms of energy

Energy in nature can be divided into: ______, ______, ______, ______, ______, etc. according to its characteristics.

2. Energy conversion and transfer

In nature, energy can ______ from one object to another, and various forms of energy can ______ each other.

3. Law of conservation of energy

Energy neither ______ nor ______, it can only ______ from one form to other forms, or from one object to other objects, and the total amount of energy ______. The transformation and transfer of energy include ______.

Energy transfer and transformation

Transfer of energy: Under certain conditions, various forms of energy can be transferred to each other. During heat transfer, the energy of a high-temperature object is transferred to a low-temperature object. When the moving steel ball A hits the stationary steel ball B, the mechanical energy of ball A is transferred to ball B. The energy form does not change during this transfer.

Energy conversion: Various forms of energy can be converted into each other under certain conditions, and energy conversion is also common in nature. When children slide on the slide, mechanical energy is converted into internal energy due to friction; in the phenomenon of gas expansion and work, internal energy is converted into mechanical energy; in hydropower generation, the mechanical energy of water is converted into electrical energy; in thermal power plants, the chemical energy released by the combustion of fuel Energy is converted into electrical energy; in a nuclear power plant, nuclear energy is converted into electrical energy; when current passes through an electric heater, electrical energy is converted into internal energy; when current passes through a motor, electrical energy is converted into mechanical energy. During the energy conversion process, the form of energy changes.

[Example] The volcanic eruption in Iceland was caused by the hot magma breaking through the earth's crust and spewing out under extremely high pressure. Explain that the flowing magma has kinetic energy, which is converted from ______ energy. The hot magma flowed in all directions, over the hillsides, and flooded the villages. Magma rushes up the hillside, converting kinetic energy into ______ energy.

Tip: First determine what energy the kinetic energy of the magma is converted into when it gushes out, and then determine what energy the kinetic energy of the hot magma is converted into when it crosses the hillside.

1. Among the following four phenomena, the process in which only energy transfer occurs but not energy conversion occurs is ()

A. In winter, my hands feel cold when I touch metal poles outdoors.

B. After closing the switch, the light bulb glows

C. When boiling tea, water vapor lifts up the lid of the pot

D. Charge the battery of the electric bicycle

2. Regarding energy and its transformation, which of the following statements is correct ()

A. When sharpening a knife with a whetstone, mechanical energy is converted into electrical energy

B. The cap of the thermos bottle is blown open by water vapor, and the mechanical energy is converted into internal energy.

C. When the electric furnace is working, electrical energy is converted into internal energy

D. For a table tennis ball moving upward, gravitational potential energy is converted into kinetic energy

3. Environmental protection is a major matter related to the national economy and people's livelihood. Using garbage to generate electricity not only protects the environment, but also saves energy. How is the energy transformed in this process ()

A.Chemical energy→internal energy→electrical energy

B. Solar energy → internal energy → electric energy

C. Nuclear energy → Internal energy → Electric energy

D. Electric energy → solar energy → internal energy

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"Conversion and Conservation of Energy" PPT courseware:

"Conversion and Conservation of Energy" PPT courseware Part One: Conversion of Energy Various forms of energy in nature Electrical energy Mechanical energy Internal energy Light energy Chemical energy Question: Can various forms of energy be converted into each other? Various forms of energy can be converted into each other...

"Conversion and Conservation of Energy" PPT:

"Conversion and Conservation of Energy" PPT Part One Content: Learning Objectives: 1. Know that various forms of energy can be converted into each other. 2. Know that during the conversion process, the total amount of energy remains unchanged. 3. List examples of energy conservation in daily life. 4...

"Conversion and Conservation of Energy" Energy, Materials and Society PPT Courseware 3:

"Conversion and Conservation of Energy" Energy, Materials and Society PPT Courseware 3 Situation Introduction Can you tell what form of energy the following objects have? 1. Transformation of energy Think about it and do it 1. Rub your hands quickly back and forth. 2. Rub the pen holder into your hair or sweater..