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"Transmission of Electric Energy" Where does electric energy come from PPT courseware
1. Transmission of electrical energy
1. Conveying method: using __________, you can __________.
2. Transmission process: power plant → __________ → high-voltage lines → __________ → power for factories or residents.
3.The working principle of a transformer is __________. The voltage of DC cannot be changed.
2. High voltage electric shock and its protection
When people or animals approach high-voltage charged objects, __________ electric shock will occur. In order to prevent such accidents, high-voltage wires are installed very high; when high-voltage wires accidentally fall to the ground, when people or animals approach, __________ electric shock often occurs. Therefore, in order to prevent high-voltage electric shock, high-voltage charged objects must be __________.
High voltage electric shock and self-rescue
Electric shock refers to an injury accident caused by a certain intensity of current passing through the human body.
There are many causes of electric shock. There are two types of electric shock: low-voltage electric shock and high-voltage electric shock.
Low-voltage electric shocks include single-wire electric shocks and double-wire electric shocks. When a person standing on the ground touches a live wire, the current enters the human body from the live wire and flows to the earth, forming a circuit and causing an electric shock. Or a person stands on an insulator and touches the live wire and neutral wire with both hands at the same time. The current flows from the live wire through the human body back to the neutral wire and forms a loop, causing an electric shock accident. As shown in the figure, this type of electric shock is caused by people's direct or indirect contact with live wires.
High-voltage electric shocks include high-voltage arc electric shocks and step voltage electric shocks. High-voltage arc electric shock is caused when the human body approaches a high-voltage charged body to a certain distance, a discharge occurs between the high-voltage charged body and the human body, and the current passes through the human body. Step voltage electric shock occurs when a high-voltage transmission line falls to the ground. Voltage exists at various points on the ground that are different distances from the broken end of the wire. When a person approaches the broken end, because the distance between the two feet is different from the broken end, there is a gap between the two feet. When the voltage is exceeded, current passes through the human body causing electric shock. High-voltage electric shock is caused by people being too close to high-voltage charged objects.
To avoid electric shock accidents, you should follow the principles of safe use of electricity, that is, do not contact low-voltage charged objects, do not approach high-voltage charged objects, do not wet electrical appliances, and do not damage the insulation layer.
If an electric shock accident occurs, first, cut off the power supply immediately, or use an insulating rod to separate the wires, and remove the electric shock victim from the power supply as soon as possible; second, try your best to rescue. During the entire rescue process, you must pay attention to your own protection at all times to prevent yourself from getting an electric shock.
Knowledge point 1 High voltage power transmission
1. Which of the following statements about high-voltage power transmission is correct ()
A. The electricity generated by the generator in the power plant is direct current
B. Low-voltage power transmission can also be used for long-distance power transmission.
C. High-voltage power transmission can reduce the loss of electrical energy
D. Only step-up transformers are used for high-voltage power transmission
2. The function of the two wires on the high-voltage transmission tower is ()
A.Transmission
B.Lightning protection
C.beautiful
D. Prevent the tower from being blown down by the wind
Knowledge point 2: High voltage electric shock
3. On a certain construction site, an accident occurred in which workers suffered electric shocks without touching high-voltage wires. But a bird standing on a high-voltage line with two paws will not be electrocuted. This is because ()
A. The cuticle on the bird’s claws is not conductive
B. Bird claws are very dry
C. There is an insulation layer on the wire
D. The voltage between the bird’s paws is very low
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