"Safe Use of Electricity" Daily Electricity PPT

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"Safe Use of Electricity" Daily Electricity PPT

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The higher the voltage, the more dangerous it is

1. Experience has proven that only voltages no higher than 36 V are safe. The higher the voltage, the more dangerous it is. Ohm's law tells us that the current in a conductor is proportional to the voltage at both ends of the conductor. The human body is also a conductor. The higher the voltage, the greater the current that passes through it. If it reaches a certain level, it is dangerous. When the body is wet, the resistance of the human body will become smaller, and the safety voltage of the human body will become lower (optional "get higher", "lower" or "unchanged").

Knowledge Point 2 Common Electric Shock Accidents

2. People have indirect or direct contact with live wires in household circuits, forming a closed circuit with the power supply equipment in the power grid, causing a large current to pass through the human body, resulting in electric shock accidents.

3. In the situation shown in the figure, an electric shock accident may occur (B)

A.A,B B.A,C

C. B, C D. A, D

4. The following situations are likely to cause electric shock accidents (D)

A. The live wire is disconnected

B. Ground the metal shell of the electrical appliance

C. Use high-power household appliances

D. When you find that the high-voltage transmission line has fallen to the ground, you rush over and use a wooden stick to pick it up.

Knowledge point 3: Principles of safe electricity use

5. Which of the following practices conforms to the principle of safe electricity use (B)

A. Press the switch with wet hands

B. Clean the bulb after disconnecting the power supply

C. The wire has exceeded its useful life and can still be used for a while.

D. Install the switch between the lamp and the neutral line

6. Safety education has attracted more and more attention from schools and all walks of life, and a series of colorful educational activities have been carried out. In a "right" and "wrong" answering competition on safe electricity use knowledge in a certain school, the "right" answer for the following options is (D)

A. Sometimes clothes can be dried on wires

B. After the fuse is blown, you can use copper wire to replace it.

C. The shells of all electrical appliances must be connected to the earth when working.

D. When flying a kite, stay away from high-voltage power lines

Knowledge point 4: Pay attention to lightning protection

7. When encountering a thunderstorm, the following is the correct approach (C)

A.Hide under a big tree to take shelter from the rain

B. Swim in the open-air swimming pool

C. Avoid using mobile phones

D. Walking in the wild holding an umbrella with a metal pole

8. After learning "Pay attention to lightning protection", several students put forward the following opinions. Which one do you think is incorrect (C)

A. When encountering thunderstorms, try to lower your body height as much as possible when in the wild.

B. In the event of a thunderstorm, close doors and windows and stay away from them

C. The two top wires of the high-voltage transmission tower are used to transmit electrical energy.

D. Lightning rods on tall buildings can avoid harm caused by lightning

Safe electricity use PPT, part 2: improvement of comprehensive capabilities

9. In order to ensure the safety of electricity, you should turn off the power switch before replacing light bulbs or moving electrical appliances in daily life; rice cookers and refrigerators use three-pin (optional "two-pin" or "three-pin") plugs.

10. Points A and B in the picture are the screws that connect the lamp head to the wire. When the switches in the circuit are turned off, if a person standing on the ground touches point A in the circuit with his hand, he will get an electric shock; if he touches the circuit with his hand, At point B, he will not get an electric shock (please fill in "yes" or "no").

11. The pictures shown are two paintings drawn by students when promoting safe use of electricity. Please provide descriptions for them.

A: Be wary of the dangers of step voltage;

B: To prevent electric shock due to high-voltage arc (just be reasonable).

12. When someone gets an electric shock or electrical equipment catches fire, which of the following actions is correct (D)

A. Immediately pull away the person who received the electric shock

B. Immediately cut the wires with a knife or scissors nearby

C. If electrical equipment catches fire, put out the fire immediately with water.

D. When someone gets an electric shock, you should first turn off the power switch or use insulators to separate the wires, and then carry out rescue operations.

13. Regarding household circuits and safe electricity use, which of the following statements is correct (B)

A. When using the test pen, do not touch the metal cap on the top of the test pen with your fingers.

B. Electrical appliances with metal casing must be grounded

C. Voltage below 220 V is safe for human body

D. If the air switch "trips", there must be a short circuit in the circuit.

14. There was a high-voltage wire overhead over a farmer's fish pond. When a fisherman lifted his pole to retrieve fish, he was electrocuted when his fishing pole touched the wire. Then, among the following statements, the incorrect one is (D)

A. This high-voltage line is a bare conductor (there is no insulation outside the conductor)

B. The fishing rod came into contact with the live line

C. The fishing rod conducts electricity

D. A bird can only land on the neutral line. If it lands on the live line, it will also get an electric shock.

15. Regarding the understanding of household circuits and safe electricity use, the correct one is (B)

A. The faster the turntable of the electric energy meter rotates, the more electric energy is consumed by the electrical appliance.

B. Turn off the power after watching TV to avoid power consumption in standby mode

C. The fuse in the fuse box is installed on the neutral line

D. The air switch trips, close it immediately to restore power supply

16. "Putting people first and creating a safe and harmonious campus" is an important part of building a harmonious society. Students must pay attention to safety and cherish life in their daily lives. Which of the following statements about safety is correct (D)

A. During thunderstorms, if people walk at high places with umbrellas, they will definitely not be struck by lightning.

B. On the socket strip of a two-wire plug, electrical appliances using a three-wire plug are equally safe.

C. The school has added two new computer rooms and only needs to replace the fuses with larger rated currents.

D. If an electric shock accident occurs, first cut off the power supply immediately, and then contact medical personnel for rescue as soon as possible.

Safe electricity use PPT, the third part: Expansion, exploration and breakthrough

18. Some insulators as shown in the figure can often be seen in high-voltage transmission lines. Please explain why the surface of the insulators hanging high-voltage transmission lines is coated with bright enamel and made into sections?

(1) The surface of the insulator is coated with bright enamel to make its surface smooth and prevent it from conducting electricity due to the accumulation of dust and dirt due to long-term exposure to the air;

(2) The segmented shape is to increase the length of the surface layer that may leak electricity, thereby increasing the resistance of the insulator and reducing the risk of leakage.

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Update Time: 2024-11-21

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