Why does the light bulb flash when the switch is not turned on?

What state is the switch in which you said the light bulb is flashing? If the switch is turned off and the bulb is about to flash, there are generally three possibilities, the wrong wire. The switch fails.

If the light bulb is on the switch and the bulb is pressed to flash when the switch is on, there are generally two possibilities, the switch fails (the contact point of the pulsating piece in the switch is rusted or oxidized).If the connector of the lamp line is loose or oxidized (replace the switch or check the line), the fault can be eliminated.

It should be that the switch wire is reversed, and the normal switch should be connected to the live wire. This phenomenon should be that the switch is connected to the neutral wire, and the bulb has been flickering due to the live wire. There are generally two possibilities in this situation, one possibility is that the insulation of the switch is relatively poor, for example, it is the rainy season, there is more moisture, and the conductivity of the water makes the insulation performance of the switch decrease, and the other possibility is that the switch is connected to the neutral line and does not control the live wire, and the lamp is in contact with the wall.

Lamps:

Lamps and lanterns are a general term for lighting tools, which are divided into chandeliers, table lamps, wall lamps, floor lamps, etc. Refers to the apparatus that can transmit, distribute and change the light distribution of the light source, including all the parts required to fix and protect the light source except the light source, as well as the necessary line accessories for connection with the power supply.

There are generally two possibilities in this situation, one possibility is that the insulation of the switch is relatively poor, for example, it is the rainy season, there is more moisture, and the conductivity of the water makes the insulation performance of the switch decrease, and the other possibility is that the switch is connected to the neutral line and does not control the live wire, and the lamp is in contact with the wall.

Will you be the neutral line of the switch control? It should be the zero line of switch control! You can swap the neutral line of fire.

This can be caused by a weak voltage.

Observe the flashing lights, whether there are multiple lights flashing in the room, and these lights belong to the same circuit, it is necessary to consider that the neutral wire and the live wire in the electric box are reversed; If the neutral line and the live wire are not reversed, it may be that the electric lamp generates self-inductive current, in this case, the flickering frequency of the LED lamp is relatively high, and the flickering frequency of the fluorescent lamp is relatively low.

The start of the electric light is driven by high voltage, and the ballast provides high voltage to it. The starter is a part that creates a circuit between the ballast and the lamp. Due to the failure of the starter, the voltage is unstable, and the bulb also flickers due to the current being strong and weak.

Home lighting options

1. Choose the brightness according to the occasion of use, the living room lamp should be slightly brighter, the lamps with slightly higher power can be selected, and other spaces can be selected according to specific needs. For lamps, we should choose good quality, sufficient brightness, and no flickering.

2. Color temperature is also a direction of choice, warm color light gives people a sense of comfort, usually the color temperature is below 3300K; 3300k-5300k is what we call warm white light, this kind of light makes people feel very pleasant; There is also a kind of cool light, the color temperature is above 5300K, this kind is very bright.

1. There is an error in the wiring, that is to say, the neutral wire and the live wire are connected incorrectly, and the circuit is reconnected.

2. The voltage of the electrical appliances used at home is too high, resulting in unstable voltage.

3. The contact between the power supply and the lamp is poor, and the current is not smooth, which will cause the lamp to flicker and flash.

4. The current of the zero line is too large, resulting in the zero line being electrified, and the lamp will also flicker.

The light bulb refers to the source of light that emits light through electrical energy, which was invented by Henri Goebbels, and Edison actually found the right material, that is, invented the practical incandescent lamp. The light bulb appeared as early as 1854, and its most common function is lighting, and with the development of society, the use of light bulbs has also played a different role.

How the bulb works:

The bulb is made according to the principle of the thermal effect of electric current. After the bulb is connected to the rated voltage, the current is heated to an incandescent state (above 2000C) through the filament, so that it heats up and emits light, so as to convert electrical energy into internal energy and light energy when working.

The structure of the bulb is very simple. At the bottom of it there are two metal contact points, which are used to connect electricity. The metal contact point has two wires that touch a thin metal filament.

The filament sits on the bulb**, supported by a glass. The wire and filament are encased in a glass bulb filled with inert gas, usually argon inert gas, and when the bulb is connected to a power source, current flows from one of the contact points to the other and then to the wire and filament.

It's not that the switch is in poor contact, it's because the indicator light in the switch is ghostly, because when the switch is turned off, the indicator light in the switch is connected to the circuit and forms a loop with the bulb, and the current is very small, resulting in a weak current flowing inside the energy-saving lamp, so it flashes and flashes, You can solve this problem by removing the indicator light in the switch, or change the switch to a good energy-saving lamp!

1. Only in the case of energy-saving lamps and the switch is connected to the zero line, there will be afterglow.

Second, in the case of the bulb, it may be that this switch is not simply a direct control bulb, but there is a control circuit board in the middle, and the control board may have problems, such as thyristors, relays, etc.

There are two possibilities: 1) the switch is ignition, and the switch "closes" the gap ignition to produce the light or a flashing phenomenon; 2) The switch is closed to the neutral line, the live wire is not cut off, and the fluorescent light can be excited, but because there is no current is not enough to light up, the lamp is still flashing and flashing.

In the second case (the test can be used), the positive and negative poles can be reversed.

Engineer you:

If the switch has been turned off and the light is still flashing, there are two possibilities.

1. The switch may be short-circuited.

2. In addition to the switch, there are other power cords that are short-circuited with the circuits of this lamp.

It is recommended to find a professional to check, I hope the car is helpful to you.

That's a simple question. The switch is connected to the zero wire. The switch should control the Firewire tick.

Just turn down the two wires on the lamp head.

It is best to cut off the two power cords (L and N) of the LED light, so that it does not flash.

Because LEDs are milliampere-level light-emitting devices, they will also emit light when they have a weak sense or voltage.

If there is a special flash controller, just match one according to the power of the bulb, if the volume and brightness of the bulb do not need to be very large, there is a self-flashing light-emitting diode, that is, the LED can be used, and the flasher is not needed.

Swap the power cord around.

This is because the capacitor is not applied to the lamp less than 3W, and the capacitor needs to be connected in parallel between the zero and live wire of the lamp.

The common causes are as follows:

1. The switch controls the zero line, and the live wire goes directly into the lamp. This is one of the most common causes of luminescence. After turning on the zero line of light control, turning off the light only cuts off the power circuit of the lamp, and the live wire is still connected to the lamp, and the lamp will glow.

Solution: Reconnect the circuit and let the switch control the live wire. ）

2. The switch has an indicator light or an electronic switch, many switches have an indicator light, if the indicator light is energized after the light is turned off, there will be a current flowing through the lamp. Some luminaires use electronic switches, such as infrared switches, voice-activated switches, and remote switches. These switches do not completely shut down the circuit.

It will also cause the lamp to glow when the light is turned off. (Solution: Remove the switch indicator or replace the mechanical switch.)

3. The wiring method of the dual control switch is wrong, there are many wiring methods of the double control switch, if the electrician adopts the following wiring method, it will turn off the light and glow. (Solution: Rewire the wire according to the neutral line to enter the lamp and control the live wire.) ）

4. Neutral line electrification, in real life, neutral line electrification is very common. If the neutral line is not well grounded, the line is too long, the wire diameter is thin, or the neutral line current is too large, it will cause the neutral line to be electrified. (Workaround:.)

It is difficult for individuals with zero line live to solve unless the transmission line is reconstructed. Keeping luminaires away from touching conductors, such as walls, roofs, and steel keels, can also reduce luminescence. ）

Summary. When the switch is pressed, the light first turns on and then goes out. This is because the filament of the bulb is passed through by an electric current for a short period of time, which generates heat, and the heat makes the filament get hotter and hotter, and eventually the filament breaks and the lamp does not light up.

This usually happens when the bulb is nearing the end of its life, or when the bulb is overcharging with more current than the bulb can handle. Therefore, when the bulb goes out, the bulb should be replaced in time to avoid greater losses.

When the switch was pressed, the light first lit up and then went out. This is because the filament of the bulb is passed through the chain by an electric current in a short period of time, which generates heat, and the heat makes the filament become hotter and hotter, and eventually the filament breaks and the lamp does not light up. This kind of stalking usually occurs when the bulb is nearing the end of its life, or when the bulb is overpowering the bulb to withstand it.

Therefore, when the bulb goes out, the bulb should be replaced in time to avoid greater losses.

Can you elaborate on that a little bit more?

When the switch is pressed to turn off the bulb, the bulb will flash briefly and then stop lit, which is caused by a faulty circuit board of the bulb. Workaround:1

Inspect the circuit board of the bulb and if you find any damaged parts, you can try replacing it with a new one to fix the normal use of the bulb. 2.Check the power supply of the bulb, if you find that the power supply is unstable, you can try to replace it with a new power supply to ensure the normal use of the bulb.

Personal Tips:1Regularly inspect the bulb's circuit board and power supply to ensure proper use of the bulb.

The circuit board of the light bulb is composed of a series of circuit components, which are responsible for controlling the current of the light bulb to ensure the normal use of the light bulb. The power supply of the bulb is the power supplied to the bulb, and if the power supply is unstable, it will also cause the bulb to malfunction.

The light switch was off, and the bulb was still flashing. So, what is the reason why the light bulb keeps shaking when the light switch is turned off? Let's learn along.

The light switch is off, but the bulb is still flashing. There are two possible reasons for this. Reason 1:

If you use a regular fluorescent lamp, the way the sunlight lamp is discharged is a gas discharge. If there is an induction power station, the lights will emit a faint flash. This is mainly because the live wire of your home's power supply is not connected to the switch, but the neutral wire is connected to the switch.

So even if the switch is turned off, the lamp will still be connected to the live wire, and the bulb will still flicker even if the switch is turned off due to the difference in potential energy that will induce an electric field. Just break the link between the live wire and the zero wire. Reason 2:

If it is an energy-saving lamp, because of the luminous principle of the energy-saving lamp, when the switch is turned on, the current enters, so that the heat transfer in the lamp becomes hot, and the mercury evaporates after being heated, and the mercury vapor is ionized, emitting strong ultraviolet rays. The fluorescent fans in the pool of lights emit near-white visible light when excited by ultraviolet light. After turning off the light, the temperature of the lamp is relatively high, so the mercury vapor is still there, so after turning off the switch, there will still be flickering.

However, when the temperature drops, there is no flickering. What causes old flickering light bulbs? One is that the voltage is unstable, and the other is that the defect is caused by poor contact.

It may be that the voltage is not enough, the wire contact is poor, the bulb is about to break if it is a spherical fluorescent lamp, that is the reason why the bulb is flashing, the reason for the unstable pressure (unlikely) If it is a tubular fluorescent lamp, it is the reason for the aging of the lamp, just change the lamp and jump the gun! What causes energy-saving lamps to flicker? The energy-saving lamp power supply system is a half-bridge switching power supply, a filter electrolytic capacitor and a DC blocking capacitor, and the resonant capacitor stores a high-voltage charge when working.

When the switch is disconnected and the alternating current is turned off, the CFL immediately does not emit light, but the remaining magnetic force stored in the magnetic coil in the lamp immediately charges the capacitors in the circuit with counter-motorized weight. When the capacitor's ability to charge hits the lamp again, the charge is discharged, and several rings are overloaded until the power is exhausted. At this point, we will see that the energy-saving lamp has several flashes of light within a few seconds to ten seconds of turning it off.

<> "What is the reason for the light bulb flashing after the lights are turned off?"

1. The switch controls the zero-crack beam line, and the live wire directly enters the lamp.

It is possible that after the switch controls the neutral line, turning off the light is just disconnecting the circuit, and the live wire is still connected to the lamp, so the lamp will still emit light, reconnect the circuit, and let the switch control the live wire.

2. The switch has an indicator light or an electronic switch.

It may be that there is an indicator light in the switch, and the indicator light is still energized after the light is turned off, and there will be a current flowing through the lamp, and the lamp will glow.

3. The wiring method of the dual control switch is wrong.

It may be that the wiring loss method is wrong, and it will glow after turning off the light, and in this case, you can reconnect the wire.

4. The neutral line is electrified.

It is also possible that the neutral line is electrified, which will cause the lamp to still have light after the lights are turned off.

How to use light bulbs safely.

1. In order to ensure that it is safer, it is necessary to check whether the bulb has air leakage, if there is, it should be replaced with a new one in time.

2. In the process of use, you must choose a bulb with suitable luminosity, not too weak or too strong luminosity, or not to damage the user's eyesight.

3. After using for a long time, too much dust will accumulate on the surface, which will also affect the aesthetics. In use, if there is an accidental electric shock stool accident, the power supply should be cut off, and the human body should be separated from the power supply with wooden sticks, and then the injured should be sent to the hospital for rescue.

As for the reason why the bulb flashes after turning off the light, it is probably the reasons mentioned above, and you can understand it clearly before dealing with it.