"Preventing Electric Shock" PPT Courseware on Safe Use of Electricity

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"Preventing Electric Shock" PPT Courseware on Safe Use of Electricity

What is electric shock?

Two types of electric shock and electricity safety

About the important component of fuse (fuse)

1. Fuse: It is made of lead-antimony alloy with high resistivity and low melting point.

2. The fuse should be connected to the main road.

3. The function of the fuse: When the current is too large, the fuse will blow and automatically cut off the circuit.

What is the cause of excessive circuit current?

Prevent electric shock

1. What is electric shock?

Is it called contact when the human body comes into contact with electricity?

Generally speaking, "electric shock" refers to an injury accident caused by a certain intensity of current passing through the human body.

Information browsing:

Electric shock refers to the direct or indirect contact of the human body with a live object (live wires in household circuits).

When the current passing through the human body is 8~10 mA, it is difficult for the human hand to get rid of the charged body.

When the current passing through the human body reaches 100 milliamps, the person will suffocate to death in a short time.

The safe current of the human body is: no more than 30mA

The safe voltage of the human body is: no higher than 36V

How to prevent electric shock

1. The switch of electrical appliances must be installed on the live wire

2. The metal casing of household appliances must be grounded with wires

3. (Do not touch low voltage, and do not approach high voltage)

Common sense about safe electricity use at home

1. The installation of household appliances must comply with specifications: the switch must be connected to the live wire; the three-wire socket should be grounded; fuses with appropriate specifications must be selected.

2. Prevent objects that should be insulated from becoming electrified

Prevent electric shock cases

(a) Prevent the insulation part of the wire from being damaged. If there is any damage, replace it urgently.

(b) Do not use a wet cloth to dry clothes, wipe electrical appliances or put it on wires

(c) Antennas should be installed away from wires

(d) The metal casing of household appliances must be grounded

(e) When you find someone getting an electric shock, immediately cut off the power supply or use an insulator to separate the wires

(f) When a fire is found in household appliances or wires, the power must be cut off first and then put out the fire.

practice

1. A classmate often burned fuses at home due to improper use of electricity. In anger, he found a piece of iron wire to replace the fuse. As a result, the "fuse" was not burned out. Do you think he did this appropriately? Why?

Answer: Inappropriate, because iron wire and copper wire will not fuse when the current is too large and will not serve as insurance. (Never try this behavior!)

2. In the picture A. Both points B are the spiral parts of the screw bulb. When both switches are turned off and a person standing on the ground touches point A directly with his hand, he ______ gets an electric shock. When he directly touches point B with his hand, he ______ _Electric shock (optional "yes" or "no").

Extracurricular homework:

1. Investigate, which parts of the home circuit and under what circumstances are the faults caused by poor contact? How to prevent such accidents from happening?

2. Complete questions 1 and 3 on P25.

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For more information about the "Safe Use of Electricity to Prevent Electric Shock" PPT courseware, please click on the Safe Use of Electricity ppt to Prevent Electric Shock ppt tag.

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Update Time: 2024-06-30

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 1 industry PPT template

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