"Safe Use of Electricity" Electric Power and Electric Power PPT Courseware 5

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"Safe Use of Electricity" Electric Power and Electric Power PPT Courseware 5

Characteristics of current mA (50Hz ~60Hz) alternating current on the human body

0.6 ~1.5 I started to feel it, and my hands trembled slightly.

2~3 Strong trembling of fingers

5~7 Hand cramps

8~10 It is difficult to get rid of the electrodes, and there is severe pain from the fingers to the wrist.

20~25 Hands become numb rapidly, unable to get rid of electrodes, severe pain, difficulty breathing

50 ~ 80 Respiratory paralysis, atrium begins to tremble

90 ~100 Respiratory paralysis, lasting for 3 seconds will cause cardiac paralysis

Above 300, when the effect exceeds 0.1s, breathing and heart are paralyzed, and tissues are thermally damaged by the current.

●Safe voltage:

Human body safety voltage: no higher than 36V

Household circuit voltage: 220V

Power circuit voltage: 380V

●The structure of the electric test pen:

●Use a test pen to identify the live and neutral wires:

Think about it:

If a bird stands on a high-voltage power line, will it get electrocuted?

●Principles of safe electricity use:

Do not come into contact with low-voltage charged objects;

Not close to high-voltage charged objects;

Do not use electrical appliances when they get wet;

Does not damage the insulation layer.

●First aid for electric shock accident:

First, immediately turn off the power switch, cut off the power supply, or use an insulator to separate the wires; then conduct on-site rescue, or call 120 for first aid.

1. Regarding the principle of measuring pen, which of the following statements is correct ( )

A. Thermal effect of current B. Magnetic effect of current

C. Chemical effect of electric current D. All of the above statements are OK

2. The reason why human body gets electric shock is ( )

A. The human body is charged with electricity

B. There is current passing through the human body

C. There is voltage on the human body

D. The current passing through the human body exceeds a certain value

3. Which of the following statements is incorrect ( )

A. If you touch a wire, you will get an electric shock.

B. Any circuit is dangerous and cannot be touched by hand.

C. In household circuits, the switch must be connected to the live wire

D. When the high-voltage line falls to the ground, do not get close to it

(2005, Dalian City, Liaoning Province) Regarding the safe use of electricity, which of the following statements is correct ( )

A. As long as you stand on an insulated wooden board and repair the light, you will not get an electric shock.

B. If the high-voltage wire falls on the ground, be sure not to get close to it

C. If you find someone getting an electric shock, you should pull the person away first.

D. When connecting the lighting circuit, the switch should be connected to the live wire

(2005, Wuxi City, Jiangsu Province) Among the following practices, which are in line with safe electricity use ( )

A. After the fuse is blown, it can be replaced with iron wire.

B. There is a power outage in the community. Take this opportunity to repair the fluorescent lamps.

C. Ground the metal casing of household appliances

D. Plug the hair dryer into the power supply and place it next to the bathtub so that you can dry your hair immediately after bathing.

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Update Time: 2024-11-22

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