LED bulbs are not divided into positive and negative poles, and LED lamps are distinguished from pos

Divide positive and negative poles.

LED bulb is the abbreviation of light emitting diode.

It is a solid-state semiconductor device that can convert electrical energy into visible light, which can directly convert electricity into light.

Nick Holoniako is a member of General Electric of the United States.

An ordinary researcher. In 1962, he developed the world's first red-emitting diodes (LED-light-emitting diodes). He believed that if red light could be obtained, it would also be possible to obtain other colors of light.

In 1963, he was in the United States in Reader's Digest

The article said that the future of lighting and display will be the world of light-emitting diodes!

The year after Holoniako invented the light-emitting diode, he left General Electric and became the University of Illinois.

Professor of Electrical Engineering. He wants to train more students through education, and through them to improve and promote the application of light-emitting diodes. Many of the PhDs in physics he taught at the university have gone on to become entrepreneurs, chief administrative officers, or researchers.

And the invention has been improved to successfully realize the marketization of light-emitting diodes.

and key components of the copier. Since the 70s of the last century, Holoniako began to extend the luminescence spectrum of LEDs to invisible light ——— infrared.

work. Infrared light is emitted.

diodes will not only change long-distance communication systems, but also computers. Today, at the age of nearly 80, Holoniake is still pursuing the dream of using light-emitting diodes to integrate a large number of optical switches on chips, thereby realizing the dream of optical computers.

A single LED lamp is divided into positive and negative poles, and the reverse can not emit light, and LED energy-saving lamps are not divided into positive and negative, and are directly used in alternating current.

Lighting bulbs are not divided into positive and negative poles.

Regardless of the input, the input is AC, and the internal output is DC.

Divide the general long legs as the positive pole!

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Regardless of whether the LED bulb is divided into positive or negative poles.

The method of distinguishing the positive and negative poles of the LED light is as follows:

1. The logo is different

SMD diodes will have an inverted triangle symbol at the bottom, one horizontal side is the positive pole, the other side is the negative pole, the side of the triangle symbol is close to the positive pole, and the corner is close to the negative pole.

2. The pin length is different

The pins of light-emitting diodes are generally longer on the positive side and shorter on the negative pins.

3. The shape of the tube is different

Observe the shape of the two lead wires in the tube body from the side, the small one is the positive electrode, and the large one is the negative electrode.

At present, LED displays have been widely used in stadiums, squares, venues and even streets and shopping malls, and the Nasdaq full-color screen in Times Square in the United States is the most famous, with an area of 120 feet 90 feet, equivalent to 1005m, made of 19 million ultra-bright blue, green and red LEDs.

In addition, the application of **** screen, bank exchange rate screen, interest rate screen and other aspects also accounts for a large proportion, and there is also a great development in the information screen of highways and elevated roads in the near future. The application of light-emitting diodes in this field has become a large-scale and an emerging industry, and it can be expected to have a relatively stable growth.

Features of LED lights:

1. Voltage: LED uses a low-voltage power supply, and the power supply voltage is between DC 3-24V, which varies according to different products, and there are a few DC36V, DC40V, etc., so it is a safer power supply than using a high-voltage power supply, especially suitable for public places.

2. Efficiency: The energy consumption is about 80% less than that of incandescent lamps with the same light effect, and about 40% less than that of energy-saving lamps.

3. Applicability:

The small size of each unit LED chip is 3-5mm square, so it can be prepared into various shapes of devices, and is suitable for volatile environments.

4. Stability:

100,000 hours, light attenuation is 50% of the initial one.

Plug-in LED lamp beads, the long legs are positive, the short legs are negative, and you can also see that the size of the two feet inside the lamp beads is different, and the big ones are negative.

In the patch type, you can see that there is a gap at one end, and the gap is negative (Figure 1), and you can also see that one side of the lamp bead is larger and the other side is small, and the small place is like a horizontal, and here it is negative. (Figure 2).

If you can't see it, find a battery, when the positive and negative poles of the battery are known, arbitrarily connect the lamp beads, and if it is on, it means that the positive pole is connected to the lamp beads, and if it is not lit, it means that the lamp beads are connected to the negative pole.

Teach you to quickly distinguish the positive and negative poles of LED lamp beads, how to measure the quality of lamp beads, many people will misjudge.

You can try it, use the power cord to plug it in, and if it is normal and bright, it will be right. If it doesn't light up, turn the positive and negative poles over.

The LED lamp is an electroluminescent semiconductor material chip, which is cured to the bracket with silver glue or white glue, and then connected to the chip and circuit board with silver wire or gold wire, sealed with epoxy resin around it, which plays the role of protecting the internal core, and finally installs the shell, so the LED lamp has good seismic performance. So do LED lights have positive and negative poles?

1. LED lights have positive and negative poles.

2. Whether to distinguish between positive and negative poles in the installation and use of LED finished lamps depends on its design and use. LED lamps used in interior decoration have a 220V AC rectifier conversion circuit inside, so there is no need to distinguish between positive and negative poles when using.

3. LED lamps and lanterns used in automobile modification and other occasions need to distinguish between positive and negative poles when installing.

However, if the LED is reversed, it is almost non-energized, and only Microsoft's current is completely negligible.

The way to distinguish the positive and negative poles of the LED light is as follows:

1. The newly bought LED has not cut the feet, and the long feet are positive.

2. Use a battery to connect the LED, if it is on, the battery is connected to the LED.

3. Use the multimeter resistance file or diode file, if it is on, the red watch pen is connected to the positive pole of the LED.

Multimeter detection method for positive and negative electrodes:

When inspecting LEDs with a multimeter, the "R l0k" position must be used. The voltage drop of the tube trapped in the LED is about 3V, and the multimeter is at the resistance of "R lk" and below. The battery in the table is only.

Below the tube pressure drop. Regardless of forward or reverse access, the light-emitting diode cannot be turned on, so it cannot be detected. The "R 1K" level has a 9V (or 15V) high-voltage battery connected to the meter, which is higher than the tube voltage drop, so it can be used to detect light-emitting diodes.

When detecting, connect the two watch pens with the two leads of the light-emitting diode respectively, such as the watch hand is deflected by more than half, and there is a bright spot in the light-emitting diode at the same time, indicating that the light-emitting diode is positively connected, and then it is the positive pole connected with the black watch pen (connected with the positive pole of the battery in the meter); The negative electrode is connected to the red watch pen (which is connected to the negative electrode of the battery in the watch). Then the two watch pens are connected with the light-emitting diode after being reversed, and the watch hand should not move. If the watch hand is deflected or does not move, regardless of whether it is in the forward or reverse direction, the LED is damaged.

There are two ways to identify the polarity of the plug-in LED lamp beads:

The length of the lead can be observed for LED lamp beads that have not yet been cut, the longer pin is the positive pole, and the shorter pin is the negative pole.

The LED lamp beads that have been cut can be used to observe the size of the internal metal sheet, usually the large end of the metal sheet is the negative pole, and the smaller end is the positive pole. Note that this method is only true in most cases, and a very small number of LEDs may be reversed.

SMD LED lamp beads are more complicated to identify polarity:

A green line or green dot is faintly visible on the front of the LED, and the pin near this green mark is the negative pole.

The use of LED lights in the home is still quite popular, not only the aesthetic effect that LED lights can bring, but also the LED lights can be used longer, but you must know the structure of LEDs, in order to use better. So do LED lights have positive and negative poles?

1. LED lights are divided into positive and negative poles.

2. The positive and negative poles can be distinguished from the pins of the LED lamp, in which the long end of the pin is the positive pole, and the short end of the pin is the negative pole.

3. In addition, it can also be judged according to the internal electrode of the LED lamp, the smaller end is the positive pole, and the larger end is the negative pole.

The above is all the content of the LED light is divided into positive and negative poles, do netizens understand?

LED bulbs are divided into positive and negative poles, usually long feet for the positive pole, short feet for the negative pole.

Light-emitting diodes are abbreviated as LEDs. Made from compounds containing gallium, arsenic, phosphorus, nitrogen, etc. When electrons recombine with holes, they emit visible light, which can be used to make light-emitting diodes.

It can be used as an indicator light in circuits and instruments, or as a text or digital display. Gallium arsenide diodes glow red, gallium phosphide diodes glow green, silicon carbide diodes glow yellow, and gallium nitride diodes glow blue. Due to its chemical properties, it is divided into organic light-emitting diode (OLED) and inorganic light-emitting diode (LED).