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"Safe Use of Electricity" Electric Power and Electric Power PPT Courseware 2
List of human body reactions to electric current
100-200 microamps is harmless to the human body but can cure diseases.
About 1 mA, causing numbness
No more than 10 mAh, people can still get rid of the power supply
When it exceeds 30 mA, you will feel severe pain, nerve paralysis, difficulty breathing, and may be life-threatening.
When it reaches 100 mA, it only takes a short time to stop the heart.
Conclusion: The stronger the current passing through the human body, the shorter the time to electrocution.
Electric shock is an injury accident caused by a certain amount of current passing through the human body.
From I=U/R
The current through the human body depends on the applied voltage and the body resistance
Safety voltage:
Under normal circumstances: voltages below 36V are safe, but in humid environments, the safe voltage is 24V or even below 12V
The function of the electric test pen: used to distinguish the live wire and neutral wire
The structure of the electric test pen: it is composed of a metal pen tip, a large resistor, a neon tube and a metal body at the tail of the pen, which are connected in sequence.
The principle of the electric test pen: There is a voltage between the live wire and the ground where the person is standing, and the resistance of the large resistor and the neon tube is much greater than the resistance of the human body, so most of the voltage is added to the large resistor and the neon tube, making the neon tube glow.
Precautions for using the test pen: 1. Never touch the tip of the pen with your fingers 2. Press the pen card with your fingers when using it
How to use the test pen:
Hold the metal body at the end of the pen with your hand and touch the tip of the pen to the incoming wire. If it touches the live wire, the neon tube will glow.
If the pen tip touches the zero line, the neon tube will not glow.
Quick answer questions
1. In order to control electrical appliances, electric keys should generally be connected in series with electrical appliances. ( )
2. The lighting in the classroom and the electrical appliances in the home circuit are all connected in parallel. ( )
3. Sockets and lamp holders in household circuits should be connected in series. ( )
4. The so-called short circuit means that the current directly forms a loop without passing through the electrical appliance. ( )
5. Fuses can be connected in series or in parallel in the circuit. ( )
6. Electric shock accidents are usually caused by the human body being directly or indirectly connected to the live wire. ( )
7. Because copper wire has a smaller resistance than a fuse of the same specification and consumes more power than a fuse when energized, copper wire cannot be used instead of a fuse. ( )
8. Electric shock accidents will occur as long as there is current passing through the human body. ( )
9. The voltage between the live and neutral wires is 220 volts. ( )
10. If you touch the neutral line of the household circuit alone, no electric shock accident will occur. ( )
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