"Generation of Electric Energy" Where does electric energy come from PPT courseware 2

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"Generation of Electric Energy" Where does electric energy come from PPT courseware 2

1. Battery

1. Dry battery

Dry batteries are devices that convert chemical energy into electrical energy. There are many types and models.

The structure of dry battery

The dry battery used daily is a zinc-manganese battery, also called a carbon-zinc battery. Its structure is: the negative electrode is a cylinder made of zinc. The purpose of making the cylinder shape is to store chemicals such as electrolytes. The positive electrode is a carbon rod, which is surrounded by a mixture of manganese dioxide, carbon powder and ammonium chloride water, collectively called a "carbon package". The space between the carbon package and the zinc cylinder is filled with a paste composed of ammonium chloride, zinc chloride aqueous solution and starch, which is called electropaste. The battery mouth should be sealed firmly with sealing agent made of asphalt, rosin, etc.

common understanding

1. Please study "Why do tomatoes make sounds" in the textbook?

2. Regardless of the number and shape of dry batteries, their voltage is 1.5V

3. Principle: Convert chemical energy into electrical energy

Do not mix different models or old and new batteries, do not throw them into fire or water, and do not disassemble them casually.

Waste batteries must be sorted and thrown into special recycling bins.

2. Battery

principle:

Convert electrical energy into chemical energy and store it, and use it to convert chemical energy into electrical energy.

(Battery 2V per cell)

3. Solar cells

1. Please read the textbook and talk about your understanding of solar cells.

2. The structure of AC solar cells and the advantages and disadvantages of using solar cells.

Advantages: Inexhaustible, no pollution

Disadvantages: limited by weather conditions

4. Fuel cell

A fuel cell is a device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through electrode reactions. The biggest feature of this device is that since combustion is not involved in the reaction process, its energy conversion efficiency is not limited by the "Carnot cycle". Its energy conversion rate is as high as 60%-80%, and its actual efficiency is that of an ordinary internal combustion engine. 2-3 times. In addition, it also has the advantages of diversified fuel, clean exhaust, low noise, little environmental pollution, good reliability and maintainability.

Thermal power generation

1. Energy conversion:

The mechanical energy of water---the internal energy of water and water vapor---the mechanical energy of the generator rotor---electrical energy

2. Advantages and disadvantages of thermal power generation

(1) Advantages: Raw materials are easy to obtain, and the equipment is simple and not affected by objective factors.

(2) Disadvantages: Burning a large amount of coal, petroleum and other fuels is non-renewable; fuel combustion will also produce a large amount of carbon dioxide, sulfur-containing gas and dust, which pollutes the environment.

hydroelectric power

1. Energy conversion:

Mechanical energy of water---Mechanical energy of hydraulic turbine---Mechanical energy of generator rotor---Electrical energy

2. Advantages and Disadvantages of Hydropower

(1) Advantages: It is a comprehensive utilization of natural resources and does not pollute the environment.

(2) Disadvantages: Its development is affected by changes in geographical location and natural conditions

nuclear power plant

Nuclear power generation uses the nuclear energy released when uranium nuclei fission in a nuclear reactor to generate electricity.

1. Energy conversion: nuclear energy---internal energy of water and water vapor---mechanical energy of generator rotor---electrical energy

2. Advantages and disadvantages of nuclear power generation

Advantages: save materials, convenient transportation, less pollution

Disadvantages: relatively few raw materials and complex structure

Power generation prospects

1. Thermal power generation, hydropower generation and nuclear power generation are the main forces of current power generation.

2. People are still studying more ways to use various resources to generate electricity, such as wave power generation, geothermal power generation, wind power generation, magnetic fluid power generation, etc. In addition to establishing solar power stations on the ground, space power stations are also planned to be established.

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"Generation of Electric Energy" Where does electric energy come from PPT courseware 3:

"Generation of Electric Energy" Where does electric energy come from PPT courseware 3 New knowledge exploration 1. Batteries 1. Batteries convert other forms of energy into electrical energy 2. Batteries provide direct current. The size and direction of direct current do not change with time. The size and direction of alternating current change with time. Time is cyclical...

"Generation of Electric Energy" Where does electric energy come from PPT courseware:

"Generation of Electric Energy" PPT Courseware Where Electric Energy Comes from 1. Battery 1. Function: It is a device that converts ________ into ______. The battery provides ______. 2. Classification (1) Chemical battery: It is a device that converts ______ into ______. Chemical batteries are mainly made of____..

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Update Time: 2024-09-07

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