There are times when plug something into a socketcan be seen as small sparks fly. One of the most common causes is the beginning of electron flow (electricity) from the electrical network to the cable. They can also be caused by short circuits.
In this article we explain how and why sparks occur in plugs and their possible dangers.
Sparks when connecting a device to the electrical network
The electrical current in Spain at a domestic level reaches us with an average voltage of 220 V and an average frequency of 50 Hz (or 50 cycles per second). This supposes a quite high electromotive force and it is the electricity that runs through the electrical installation of any home.
The plugs or outlets in the house they take advantage of this flow of electrical current to divert part of the electricity to any device that has been connected.
There may be various technical explanations to explain the phenomenon of sparks in plugs, but the most common is that the current that comes out of the plug goes from zero to a higher value very quickly and the current itself appliance inductancewhich presents some resistance to this sudden electrical flow, causes the spark.
That's why, the higher inductance in the device, the easier it will be for sparks to appear when connected to an electrical outlet.
In appliances and devices that have a voltage inverter, sparks are more likely to occur, since they have a greater inductance.
As soon as the flow of electrons is established between the device and the electrical network, the spark disappears and there is no more danger.
Danger: short circuits
In most cases these sparks in the plugs are a normal phenomenon that does not represent any danger. However, in some cases it can be problematic.
Electrical energy can produce heat and, when this heat is excessive, it can be melt the insulating material of the wiresfrequently materials thermoplastic.
If the wires are exposed they can come into contact with each other or with the metal of the plug. If any device is connected in this situation, a short circuit with a more powerful and visible spark than the one described above.
The short circuits caused by overheating can cause, in addition to the spark, a source of ignition and is one of the main causes of home fires.
The safety mechanisms of electrical installations should interrupt the electrical current at the slightest short circuit, which reduces drastically the chances of fire from this cause.
But if the wiring and electrical installation of the house is defective, the short circuit can cause the entire installation to heat up and cause fire even inside the walls.