Is there a spark when you turn on the switch? Is it dangerous? Is there any way to avoid sparks?

In the case of relatively large current, when disconnecting the beginning, it will produce a large reverse voltage and current due to the self-inductance phenomenon in the circuit, and the electric spark is easy to hurt people and dangerous to people.

You can refer to the circuit below to connect the electromagnetic relay.

If to avoid electric sparks, it is also possible to immerse the beginning in insulating oil. This kind of oil-immersed switch is also available on the market.

There is a spark when the plug switch is opened, the danger is still there, it is easy to ignite the item, you can use a safer switch, such as an empty switch or a home wall switch, it is best not to use the plug switch, this spark can not be avoided.

Buy a big brand power strip, and don't choose that universal hole power strip. Recommend Huntkey's power strip, good.

If there is a danger, a diode can be added

This spark is called arcing, and when the plug touches the metal contact in the socket, there may be a small spark due to the small contact area and the instantaneous flow of current through the contact.

As a result, slight damage will be seen on the plug on the transformer, which is normal.

When the spark is large or the socket is blackened (as shown below), please stop using it.

This phenomenon is caused by the aging of the socket, the insufficient clamping force of the internal copper sheet, or the moisture vapor and oxidation of the socketIf this is the case, please replace the socket or extension cord immediately to ensure safety.

Solution: Please replace the socket or extension cord with better quality, if the clamping force of the copper sheet inside the socket is insufficient or the copper sheet is oxidized, the socket also needs to be replaced immediately.

The inside of the mobile phone flush is the switching electric original circuit, and the current when it is just plugged in is very large, and it is not surprising that there are sparks, it doesn't matter, it doesn't mean that you can eliminate the sparks by buying a bull socket! Just because there is a spark doesn't mean that the socket you bought is faulty or fake! It's normal to have momentary sparks when plugged in.!

But you should pay attention, if it is plugged in all the time or often sparks, and it is accompanied by a sizzling sound, it means that there is a poor contact, then you should check your charger plug and your socket!

1. The distance between the plug and the socket is changing, when the distance is very close, the voltage can break through the air and conduct electricity and produce high temperature. Sparks are formed.

2. There is inductance in electrical wires, and the inductance will produce high voltage at the moment of power failure, and the plug and socket are connected or disconnected in a process that is in a state of seeming to be connected and not connected, and the high voltage formed by the inductor breaks down the air to produce sparks.

It means that the plug blade is loose, and the greater the power of the electrical equipment, the stronger the electric spark will be. Therefore, this socket needs to be replaced, otherwise there will be potential safety hazards, and it is not good for electrical equipment.

When the plug comes into contact with or separates from a live socket, the air will be broken down by electricity, causing a solitary light, which is the electrical spark you see. This is normal.

The principle effect of the capacitor inside the appliance is instantaneously short-circuited, so there will be instantaneous sparks.

There is no problem, this is mainly caused by the layout and structure of circuit components, which is a normal phenomenon.

Of course, it is dangerous, which has great damage to the plug and socket, and frequent plugging and unplugging can easily cause poor contact, heating and even **, so try to turn off the switch when the high-power electrical appliances are plugged in, put an end to ignition and ensure safety.

The "electric spark" in the common colloquial language actually has a technical term called "electric arc".

Arcing occurs when two conductors (one of which carries a voltage of more than 20 V) are in close proximity to each other but are not in direct contact (virtual connection), and the voltage directly breaks through the air to produce an electric current. Due to the large air resistance, the current in the air has the characteristics of high temperature and luminescence - almost all large resistance conductors will emit high temperature and bright light when the current flows through the conductor, such as tungsten filament (incandescent lamp), electric stove, etc.

To put it in more detail: when two conductors are virtually connected, the electric field strength is greatly affected by the curvature of the contact surface, and under the action of the strong electric field, the surrounding air is ionized, producing a large number of charged ions.

These ions move under the action of an electric field, which in turn creates an electric current. But the electric field here is not closed, but in the air. When neutral particles in the air (dust, unionized air, etc.) come into contact with charged ions, kinetic energy is released – causing light and heat.

It works.

It is normal for the plug to be inserted into the socket to produce sparks, the greater the power of the plug-in, the more obvious the electrical appliances, without Nianming will cause the current to be unstable, only the high-power electrical appliances will produce a certain voltage drop after access, and the small drop in current caused by the general electrical appliances has no effect, some electronic appliances such as TVs, computers have voltage stabilization circuits at the power supply. EDM isn't a big deal.

If you are afraid of crackling discharge, you can plug in the charger with the power out of the socket and turn on the power switch, so that the discharge will occur in the enclosed space of the power switch and will not disturb you.

Precautions for the use of the charging head.

Before charging for the first time, read the charger instruction manual carefully, operate according to the instructions, and whether the power supply of the charger is consistent with the local mains voltage. If the charger has two voltages to choose from, you should carefully look at the position of the conversion button on the charger, and the voltage should be consistent with the local voltage.

When using the charger to charge the battery, plug in the output plug of the charger first, and then the input plug. When charging, the power indicator of the charger shows red, and the charging indicator also shows red; When fully charged, the charging indicator is green. When stopping charging, unplug the input plug of the charger first, and then unplug the output plug of the charger.