"Safe Electricity Use" PPT download of daily electricity use

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"Safe Electricity Use" PPT download of daily electricity use

Part One: Knowledge Management

1. electric shock

The danger of electric current to the human body: It is related to the size of the voltage, the size of the current, the size of the human body's resistance and the length of time the electricity is on.

Safety voltage: no higher than 36 V.

First aid for electric shock: as shown in the picture.

(1) Cut off the power supply;

(2) Quickly remove the electrocuted person from the power source.

Note: Electric shock in household circuits is caused by the human body being directly or indirectly connected to live wires.

2. Electricity safety

Principles for safe use of electricity: (1) Do not come into contact with low-voltage charged objects, and do not approach high-voltage charged objects;

(2) Turn off the power switch before replacing light bulbs or moving electrical appliances;

(3) Do not get the electrical appliance wet or damage the insulation layer;

(4) Safety devices, sockets, wires, household appliances, etc. should be replaced in time when they reach the end of their service life.

Note: The voltage of household circuits is 220 V, and the voltage of power circuits used in factories is 380 V. Although they are both called low-voltage circuits in electrical technology, they greatly exceed the safe voltage of the human body, so do not compare the voltage of low-voltage lines with Safety voltage is confused.

3. Pay attention to lightning protection

Lightning: A violent electrical discharge phenomenon in the atmosphere.

Lightning rod: The lightning rod is installed on the top of a tall building. The lower end of the rod is connected to a thick enough copper wire, and the lower end of the copper wire is connected to a metal plate and buried deep underground in a moist place. It works using the principle of tip discharge.

Safe electricity use PPT, part 2: classification and exploration

Type one: Electric shock accident

[2018•Mianyang, Sichuan]As shown in the picture, A is standing on a dry wooden table with one hand touching the live line; B is standing on the ground with one hand touching the zero line; C is standing on a dry wooden table. A hand on the table touched the live wire. At this time, Ding stood on the ground and pulled Bing with his hands. Then (D)

A. Both A and B will get electric shock

B． Both A and C will get electric shock

C. Both B and D will get electric shock.

D. Both C and D will get electric shock.

[Analysis] A stands on a dry wooden table and touches the live wire with one hand, which cannot form a path for current, so no electric shock will occur; B stands on the ground and touches the neutral wire with one hand, because there is no connection between the neutral wire and the earth. voltage, so there is no current passing through the human body and no electric shock will occur; C is standing on a dry wooden table and touches the live wire with one hand. At this time, D is standing on the ground and pulls C with his hand, so that the current can flow from the live wire through C, Ding leads to the earth, which will cause C and D to be electrocuted at the same time. To sum up, neither A nor B will get an electric shock, but both C and D will get an electric shock. Choose D.

[Method Summary] From the perspective of safe electricity use, it should be noted that there are two types of electric shock: direct electric shock and indirect electric shock. When the human body directly or indirectly contacts the live wire and forms a current path, current will flow through the human body, causing electric shock. If someone gets an electric shock and pulls it directly with hands, indirect electric shock will occur.

Type 2: Common sense about safe electricity use

[2019•Beijing Haidian District]Among the following options, which one complies with the principle of safe electricity use (C)

A. Wipe the TV when it is in use with a damp cloth

B． Flying a kite under high voltage lines

C. When someone gets an electric shock, the power supply should be cut off first

D. Continue to use wires with damaged insulation

[Analysis] Water is a conductor of electricity. When wiping a live electrical appliance with a wet rag, an electric shock accident may occur due to the conduction of the wet rag, so A is wrong. When flying a kite near a high-voltage line, once the kite comes into contact with the high-voltage line, it will cause an electric shock to the human body, so B is incorrect; when someone is found to have received an electric shock, the immediate measures to be taken are: quickly cut off the power supply or use an insulator to separate the wires, so C is correct; still using wires with damaged insulation is prone to electric shock accidents, so D is incorrect.

[Summary] Principles for safe use of electricity: Do not contact low-voltage charged objects, and do not approach high-voltage charged objects. Special note: Water easily conducts electricity. Do not hang wet clothes on wires or turn switches with wet hands. Do not take shelter under trees during thunderstorms.

PPT on safe use of electricity, the third part: in-person evaluation

1. [2017•Guangxi]In the electrician's live operation as shown in the picture, the electric shock accident will not occur (B)

2. [2018•Hunan Xiangtan]The following situations meet the requirements for safe electricity use (B)

A. Fishing under overhead power lines

B． Refrigerators should not be placed in kitchens that use gas

C. Install the switch on the neutral line

D. When using the test pen, do not touch the metal body at the end of the pen with your hands.

3. [2018•Xining, Qinghai]“Cherish life and use electricity safely” is a safety awareness that students must have in their daily lives. In household circuits, in order to prevent electric shock, the switch of the electrical appliance must be installed on the live wire; when a fire is found in a household appliance or wire, the power must be cut off first, and then the fire can be put out.

Safe electricity use PPT, part 4: layered operations

1. [2018•Beijing] Which of the following practices meets the requirements for safe electricity use (C)

A. Continue to use electrical appliances even if their insulation is damaged

B． Replacing a light bulb without disconnecting the power supply

C. Install air switches or fuses in home circuits

D. Flying a kite near high voltage lines

2. [2019•Beijing Daxing District]Among the following four phenomena, the one that conforms to the principle of safe electricity use is (　D　)

A. Replacing a light bulb without disconnecting the power supply

B． Use wires with damaged insulation

C. Wipe the working desk lamp with a damp rag

D. Use an insulating rod to open up the live bare wires

3. [2019•Yexian County, Henan Province]Xiao Ming accidentally came into contact with the metal casing of the motor and suffered an electric shock. The reason was that the metal casing of the motor was not grounded and the metal casing was charged. At the scene of an electric shock accident, do not pull the person who received the electric shock with your hands, but cut off the power supply immediately.

4. [2019•Shandong Dongying]As shown in the picture, A and B are standing on a dry wooden bench, and C is standing on the ground and holding hands with B. The two exposed wires above and below are for the lighting circuit. Live wire and neutral wire, then what will definitely cause electric shock is (A)

A. A B. B, C

C. A, C D. A, B, C

5. [2017•Zhejiang Hangzhou]As shown in the picture, two birds are sitting on exposed wires and answer the following questions:

(1) Why does the bird on the right get an electric shock?

Answer: The two feet of the bird on the right are in contact with both ends of the electric lamp (connected in parallel). There is a certain voltage and current flows through the bird's body, which will cause an electric shock.

(2) Why is the bird on the left standing on the wire not dangerous?

Answer: The two feet of the bird on the left are on the same wire. There is no voltage between the two points, no current flows, and there is no electric shock.

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Update Time: 2024-09-20

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