Why does it get dark at both ends when the lights are turned off for a long time?

The principle of fluorescent lamps is that when the switch is switched on, the supply voltage is immediately added to the two poles of the starter through the ballast and the lamp filament. A voltage of 220 volts immediately ionizes the inert gas of the starter, producing a glow discharge.

The heat of the glow discharge causes the bimetal sheet to expand by heat, and the poles come into contact. The current passes through the ballast, the starter contact pole and the filaments at both ends to form a path. The filament is quickly heated by an electric current, emitting a large number of electrons.

At this time, due to the closure of the two poles of the starter, the voltage between the two poles is zero, the glow discharge disappears, and the temperature in the tube decreases; The bimetal sheet automatically resets, and the poles are disconnected. At the moment when the poles are disconnected, the circuit current is suddenly cut off, and the ballast generates a large self-induced electromotive force, which acts on both ends of the tube after superimposing with the power supply voltage. A large number of electrons emitted by the filament when heated move from the low potential end to the high potential end at great speed under the action of high voltage at both ends of the lamp.

In the process of accelerating motion, the argon molecules in the tube collide, causing them to ionize rapidly. Argon ionizes to generate heat, and the heat causes the mercury to produce vapor, which is then ionized and emits intense ultraviolet light. When excited by ultraviolet light, the phosphors inside the tube wall emit near-white visible light.

After the fluorescent lamp glows normally. Because the alternating current continuously passes through the coil of the ballast, the self-induced electromotive force is generated in the coil, and the self-induced electromotive force hinders the current change in the coil, so that the ballast takes off and lowers the current limit, so that the current is stabilized within the rated current range of the lamp, and the voltage at both ends of the lamp is also stable within the rated working voltage range. Since this voltage is lower than the ionization voltage of the starter, the starter connected in parallel at both ends no longer works.

If the current impact time is long, the phosphor at both ends of the lamp will turn black first, and the time will be long, and the lamp will not shine (the phosphor can not be lit).

Fluorescent lamps are not ordinary tungsten lamps!

Re-down. The high temperature inside the bulb makes the tungsten filament directly sublimated into gas, and then the gas condenses on the wall of the bulb to form a solid tungsten filament, so it will be black inside.

This is because fluorescent lamps work on the same basic principle as light bulbs, using the electrothermal effect of metal (tungsten filament is now commonly used) to emit light. The electric heating effect can make the temperature of the tungsten filament quite high, causing the tungsten filament to sublimate, and the sublimated gas condenses on the tube wall. Over time, the ends will turn black.

This is because tungsten filament is made by sublimating after a long time and then condensing at both ends.

It should be an air leak, and it's full of phosphor.

The phosphor does not turn black, what turns black is that the filament condenses on the wall of the lamp after sublimation.

No, we can't contribute to the world's energy conservation.

This already has a standard earth hour.

You can read Kai Qiao years to supplement and improve There's no need to be ingenious to create another one.

Earth Hour"It is an initiative of the WWF (World Nature) to address global climate change, hoping that individuals, communities, businesses and enterprises will show their support for climate change action by turning off the lights for one hour at a specific time. In 2009, Earth Hour aims to involve about 1 billion people in 1,000 cities around the world and turn off the lights for an hour at 20:30 p.m. on March 28, 2009 to demonstrate public support for a new global agreement on climate change. Slippery grip.

Refer to this envy to call a brother Kai ruler base.

The world is March 29.

In Asia, it's June 21.

Fluorescent lamps are not connected to other ordinary lamps. Mark the left side as 1,2 two lead angles, and the right side as 3,41 and 3 are indirectly curved tubes (the lighting device of the fluorescent lamp, and there is also a rectifier inside).

2,4 can be connected to the positive and negative of the power supply, and the market is generally connected, and the lamp is placed in it. That is not enough, your lifter is broken, and it cannot be disconnected to form a high-voltage lighting tube.

Fluorescent lamp? It should be simple.

Four-wire ballast: The four-wire ballast has four leads, divided into main and auxiliary coils, and the two leads of the main coil are connected in the same way as the two-wire ballast, which are connected in series between the lamp and the power supply. The two leads of the secondary coil are connected in series between the starter and the lamp to help with start-up.

Due to the small number of turns of the secondary coil and the low AC impedance, if it is mistakenly connected to the main circuit of the power supply, the lamp and ballast will be burned.

If it is a fluorescent pipe bracket, only connect the live wire and the neutral wire.

One is connected to the fire line and the other is connected to the zero line.

The switch is in the live wire, before the electric light, if it is a socket, the above point is connected to the live wire

Switches, lights, connected in series on the wire OK

Today: March 27!! 20:30 to 21:30!!Got it???

What started as a rallying call for Sydney residents to turn off the lights has grown to become one of the world's biggest actions on climate change.

On March 28, 2009 at 8:30 p.m., people around the world will turn off their lights for Earth Hour.

We hope that more than 1,000 cities and 1 billion people will participate in this event and use global efforts to combat climate change.

Earth Hour was first launched in Australia in 2007 when around 2.2 million Sydney homes and businesses turned off their lights for an hour.

Just one year later, however, Earth Hour has become a global and growing event, with more than 5 million people in more than 35 countries participating.

Landmarks in major cities around the world, such as the Golden Gate Bridge in San Francisco, the Colosseum in Rome and the Coca-Cola billboards in Times Square, have been left in the dark, and residents of cities have expressed their enthusiasm for the urgent cause of environmental protection.

Earth Hour 2009 is a global initiative that calls on everyone, every business and community to take action, get involved, and take responsibility to create a sustainable tomorrow.

Landmarks from all over the world, from Europe to the Americas, will be in the dark.

And the people of the world will work together to create a better tomorrow for the earth by turning off the lights.

More than 64 countries and territories have participated in Earth Hour 2009. And as more and more people realize that a small gesture can have a huge impact on the end result, so does the number of participants.

Let's take action together! On March 28, 2009, from 8:30 p.m. to 9:30 p.m., turn off the lights for one hour and write history with China. Earth Hour is a symbol of hope as well as action. Everyone can make a difference.

On March 28, 2009, starting from Fiji, cities in Asia, such as Australia, Japan, Singapore, China, and Indonesia, will be the first to turn off their lights, followed by cities in Europe and the Americas.

Let's join hands to create this beautiful 'dark hour' together." ”

The famous pianist Lang Lang put forward his own suggestions for everyone: "Enjoying ** in a dark environment can be more highly concentrated and fully immersed in the melody." At that moment, you will be deeply moved and will spark your imagination. ”

Less than a week after the official launch of Earth Hour 2009, the global action on climate change launched by the World Wide Society for Nature has received support from 63 countries and regions and 242 cities.

The number of cities that have been confirmed to participate in Earth Hour is growing....

Baoding origin.

Earth Day events originated in the United States.

In 1969, U.S. Democratic Senator Gaylord Nelson proposed that lectures on environmental issues be held on university campuses across the country. Dennis Hayes, then a 25-year-old Harvard Law student, quickly turned Nielsen's proposal into a concrete idea for a large-scale community event across the United States, which was widely supported by many young students.

On April 22, 1970, the United States held its first massive "Earth Day" event. This is the first large-scale mass environmental protection movement in the history of mankind.

As the beginning of the modern environmental protection movement, the "Earth Day" event promoted the establishment of environmental regulations in many countries. On April 22, 1990, more than 200 million people in more than 140 countries around the world held a variety of environmental protection publicity activities at the same time. This activity has been endorsed by the United Nations.

Since then, "Earth Day" has become "Earth Day".

The earth is the common home of mankind, however, with the development of science and technology and the expansion of economic scale, the global environmental situation has continued to deteriorate over the past 30 years. Data show that the global average annual temperature has increased by degrees Celsius since 1860, with the 13 warmest years occurring after 1983.

In the 80s of the twentieth century, the number of people affected by disasters in the world averaged 14.7 billion per year, and by the 90s of the twentieth century, this number had risen to 21.1 billion. About 40 percent of the world's population is currently experiencing severe water scarcity, and if this trend is not halted, more than 55 percent of the world's population will face water scarcity within 30 years. The deterioration of the natural environment is also a serious threat to the wild species on the planet.

Today, 12 percent of the world's birds and one in four mammals are threatened with extinction, and overfishing has depleted one-third of fish stocks.

The purpose of the Earth Day activities is to arouse the awareness of human beings to care for the earth and protect their homeland, and to promote the coordinated development of resource development and environmental protection. Since the 90s of the 20th century, China has held Earth Day activities on April 22 every year.

Baoding City, this year, the corresponding call for a one-hour power outage from 8:30 p.m. to 9:30 p.m.