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Authoritative PPT Summary
"Conversion and Conservation of Energy" Energy, Materials and Society PPT Courseware 2
1. Various forms of energy
1. Expression of energy
2. Energy categories in nature
Mechanical energy, electromagnetic energy, internal energy, chemical energy, nuclear energy, etc.
①Chemical energy: energy generated due to changes in the molecular structure of a substance when a chemical reaction occurs
The light and heat produced when wood burns come from the chemical energy stored in the wood. The energy consumed by human body movement comes from the chemical energy stored in food.
②Nuclear energy
Energy produced by changes in the atomic structure of a substance due to nuclear reactions
2. Energy transfer and conversion
1. Various forms of energy can be converted into each other
2. Most of the energy on earth comes from the sun
Experimental Exploration: Transformation of Energy
A.Experimental design
B.Experimental conclusion
Release the weight first
① When a heavy object falls, the gravitational potential energy of the heavy object is converted into the kinetic energy of the heavy object; the motor converts the kinetic energy into electrical energy; the electrical energy is transmitted to the light bulb through the wire, the light bulb emits heat, and the light bulb converts the electrical energy into light energy and internal energy; the motor rotates for a period of time Afterwards, it will generate heat, and the motor will also convert electrical energy into internal energy.
Convert light bulbs to battery power
② When the motor rotates, the chemical energy in the battery is converted into electrical energy; the electrical energy is transmitted to the motor through the wire, and the motor rotates to convert the electrical energy into kinetic energy; the rotation of the rotating shaft lifts the heavy object, and the heavy object will obtain kinetic energy and gravitational potential energy as it rises; the motor rotates It will still generate heat after a period of time, and the motor will also convert electrical energy into internal energy.
3. Law of conservation of energy
1. Law of conservation of energy
A large number of studies have shown that energy in nature is conserved
Energy conservation law
Energy is neither destroyed nor created, it is only transformed from one form to another or transferred from one object to another, while the total amount of energy remains the same.
Conversion of kinetic energy and potential energy
2. “Perpetual motion machine” does not exist
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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..