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Authoritative PPT Summary
"Safe Use of Electricity" Electric Power and Electric Power PPT Courseware 3
Modern family life is inseparable from electricity, so how can we use electricity safely? Let us learn how to use electricity safely together
Question: What does it mean to get an electric shock?
Clarification: The human body is a conductor. When the human body touches a charged object, a high current passes through the human body. This is an electric shock.
Question: What factors are related to the danger of electric current to the human body?
It is clear: the danger of electric current to the human body mainly depends on the size of the current, the length of time the current is energized, and the parts of the human body where the current passes through. In addition, there is data indicating that AC and DC currents of the same voltage are more harmful to the human body.
Question: Will the human body definitely die if it is electrocuted? What is the safe voltage value?
Electrical currents passing through the human body Humanistic sensations and reactions:
1mA begins to cause numbness;
10mA has a numbing sensation, but you can get rid of it;
30mA severe pain, nerve paralysis, difficulty breathing, life-threatening;
Turning on 100mA will cause suffocation and cardiac arrest within a short period of time.
Voltage not higher than 36V is safe voltage
First aid for electric shock
It is clear: People must be saved but their own safety must be ensured. Do these three methods work?
1. Cut off the power supply
2. Use a dry wooden stick to spread the
3. Artificial respiration
Principles of safe use of electricity
Do not come into contact with low-voltage charged objects, do not approach high-voltage charged objects, and be alert to objects that should not be charged, and objects that should be insulated to conduct electricity:
1. Prevent damage to the insulation part
2. Keep the insulation part dry
3. Avoid contact between wires and other metal objects
4. Regular inspections and timely repairs are required.
Summary of safe electricity use
1. The voltage that is safe for human body use is: no higher than 36V.
2. Forms of electric shock: "low-voltage electric shock", single-line electric shock, double-line electric shock
"High-voltage electric shock" arc electric shock, step voltage electric shock
3. Principles for safe use of electricity: Do not come into contact with low-voltage charged objects, and do not approach high-voltage charged objects.
4. First aid methods for electric shock (cut off the power, use a dry wooden stick to push away, artificial respiration)
Classroom training
What is the reason why the following situations do not cause electric shock when the human body is standing on a dry wooden ladder to inspect lighting circuits?
A. Hold the live wire with one hand and the neutral wire with the other hand.
B. Hold the line of fire with one hand
C. Hold the live wire with one hand and hold the wall with the other
Analysis: Hold the live wire in one hand and the neutral wire in the other, and the current will form a loop; hold the wall in one hand, and the current will enter the wall through the human body and form a loop, which will of course result in electric shock.
Question: The human body gets an electric shock when it comes into contact with a 220V bare wire, but a bird is fine when it stands on a high-voltage bare wire. Why is this?
A. Birds have low resistance
B. Birds do not conduct electricity when they are dry
C. The bird’s two feet are on the same line
D. Birds are small in size
Analysis: People and birds are both conductors. People standing on the ground and coming into contact with 220V live wires will cause electric shock accidents. The voltage on high-voltage wires refers to the voltage between two high-voltage wires or between high-voltage wires and the ground. Birds stand with two feet on the same wire. The high-voltage lines are very close together and the voltage is very small, so there is no chance of electric shock.
Operation
1. How do electric shock accidents occur in household circuits?
2. What should we be particularly vigilant about when using electricity in daily life? Is safe voltage absolutely safe?
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