"Electricity and Our Life" PPT

Hunan Education Edition fifth grade science, electricity and our lives PPT courseware

The first part contains:

1. Stories about scientists related to electricity

How is electricity produced? When answering this question, we have to mention a great scientist-Faraday. Electricity is generated by magnetism: One day, Faraday got a cylindrical magnet, 8.5 inches long and 3/4 inches thick, and wound it with 203 feet of copper wire in an empty cylinder. , an ammeter is connected in series to both ends of the copper wire, and the copper wire does not carry current. He put one end of the magnet close to the copper wire, and the pointer of the galvanometer did not move. Suddenly he inserted the magnet completely into the copper coil, and the pointer of the galvanometer suddenly moved. He hurriedly pulled the magnet back, and the pointer moved again. Is there really any current generated? Faraday was pleasantly surprised. He tried again and again, and sure enough, the induced current was generated. This was the biggest discovery of Farah's life.

2. Methods and principles of power generation

Solar cells generate electricity through solar cells, also called photovoltaic cells (which are flat crystals made of thin films of various semiconductor materials with different electronic properties, which can generate a strong internal electric field). In order to protect these photovoltaic cells from environmental influences, They need to be connected and packaged in a module. When light enters the crystal, the electrons generated by the light are separated by these electric fields, creating an electromotive force between the top and bottom surfaces of the solar cell. At this time, if a circuit is connected, DC current will be generated, which is stored in the battery, and then converted into the required AC power by the solid-state electronic power conditioning device to provide to various loads. Therefore, when there is no sun at night, the load can still work normally.

Solar cell power generation systems can be divided into two types: solar thermal power generation and solar photovoltaic power generation. Solar thermal power generation uses solar energy to heat water and generate steam to drive the steam turbine generator set. According to different thermoelectric conversion methods, solar power stations are divided into concentrated solar power stations and decentralized solar power stations. Tower solar power station is a type of centralized solar power station. It lays a large number of collector arrays on the ground, builds a high tower at an appropriate location in the array, and sets a heat absorber on the top of the tower. The solar heat from the collector is collected. to the heat absorber, which increases the temperature of the working medium in the heat absorber, turns into steam, and sends the steam to the steam turbine generator set on the ground through the pipeline to generate electricity.

Electricity and Our Life PPT Courseware, Part 2: The Uses of Electricity

Uses of electricity

Appliance name: TV, computer, air conditioner

Brands of home appliances: Hisense, Lenovo, Midea

Price: 2500, 5000, 550

Performance: HD, multimedia, cooling

How to use: remote control touch screen, remote control’

Note: waterproof, fragile waterproof, fragile no

Electricity and Our Life PPT Courseware, Part 3: Group Report

3. Report of the electricity conservation group

1. Why should we save electricity?

2. The phenomenon of not saving electricity in daily life

Multiple TVs are turned on at the same time, and multiple computers are used at the same time;

The power will not be cut off when the TV is not being watched and it will remain in standby mode for a long time;

Several incandescent lamps with dozens or hundreds of watts are turned on at the same time;

The voice-activated light sensor is broken, so the lights stay on day and night;

The water dispenser operates 24 hours a day;

Some electric heating households use several large electric stoves with several kilowatts in winter without blinking an eye;

I turned on the faucet and left it running for several minutes. When the hot water came out, I slowly washed up...

3. How to save electricity?

(1) Use energy-saving lamps. Under the same brightness, energy-saving lamps save 80% of electricity than incandescent lamps.

(2) Do not leave home appliances on standby. When the power switch of household appliances such as TVs and air conditioners is not turned off, their internal infrared receiving remote control circuits are often in standby mode and are still consuming power. (3) Reduce the number of times the refrigerator door is opened, and hot food can be cooled before being placed in the refrigerator to save energy.

(4) Cover the rice cooker with a towel to reduce heat loss.

(5) Clean the scale on the electric heating tube in the electric kettle in time to save energy.

(6) When ironing clothes with an electric iron, iron the clothes with lower temperature resistance in the initial stage of powering on, and then iron the clothes with higher temperature resistance after the temperature rises. After the power is turned off, iron some clothes with lower temperature resistance.

Electricity and Our Life PPT Courseware, Part 4: Tips

Tips for saving electricity:

1. All electrical appliances should be turned off in time when not in use, and unplugged if not used for a long time.

2. The air conditioner temperature should be adjusted to the most energy-saving 26 degrees.

3. It is not advisable to store too much food in the refrigerator and it should be cleaned regularly.

4. Minimize the number of times the refrigerator door opens and closes, and close it promptly after use.

5. Small items of clothing should be washed by hand and try not to use a washing machine.

Electricity and Our Life PPT Courseware, Part 5: Common Sense

Common sense about safe electricity use:

1. Learn to read the safe electricity signs. Red: Used to indicate prohibition and stop information. When encountering a red sign, it is strictly forbidden to touch it. Yellow: used to mark danger. Such as "beware of electric shock", "pay attention to safety", etc.

2. Understand that electric current passing through the human body will cause casualties. All metal products are conductive, so never use these tools to come into direct contact with the power supply. For example: Do not touch or test the inside of the power socket with your hands or conductive objects (such as wire, nails, pins and other metal products).

3. Usually water is also conductive. Be careful not to get water on electrical appliances, so do not touch them with wet hands or wipe them with a wet cloth. For example: when the TV is on, do not wipe it with a wet towel to prevent water from dripping into the casing and causing a short circuit, which may damage the TV and cause personal injury. Do not use wet hands to connect the plug, as this may cause electric shock.

4. If you find someone getting electric shock, try to turn off the power supply immediately. Do not use your hands to rescue people directly. Call an adult for help. Do not handle it yourself to prevent electric shock. Wood, rubber, and plastic do not conduct electricity and are called insulators. These tools can directly contact the power source and will not cause electric shock. You can use dry wooden sticks and other objects to separate the electric shock victim from the live electrical appliances.

5. Understand the main power switch. Learn to turn off the main power supply in an emergency.

6. Electrical appliances should be unplugged after use. Do not pull hard on the wire when plugging or unplugging the power plug to prevent damage to the insulation layer of the wire and an electric shock.

7. Do not disassemble or install power lines, sockets, plugs, etc. at will. Even simple things such as installing light bulbs must be turned off first and done under the guidance of parents.

8. When you see a fallen wire, be sure to stay away. Do not touch exposed threads with your hands.

9. There are many dangers near the switch box. Don't play near the electric switch, and don't move it at will to avoid short circuit, leakage and other dangers.

10. Protect against lightning in rainy days. If it rains, thunders, or flashes, turn off the TV, stereo, and unplug the power plug.

Keywords: Hunan Education Edition fifth grade science PPT courseware free download, electricity and our lives PPT download, .PPT format;

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"Electricity and Our Life" PPT:

Hunan Education Edition fifth grade science volume 1, electricity and our lives PPT, the first part: the origin of electricity, talk about how electricity changes our lives. Language reports can be organized within the group. Where does electricity come from? Get to know the hand-operated generator. Electricity comes from the power plant to our homes..