Why does a loose connection produce sparking .?

Answer 1

There are always some free electrons or ions in the air between the two wires. In the electric field the are accelerated. By bouncing against the molecules of the air these molecules are ionized. Etc. (cascade effect)
When the electrons fall to a lower energetic state again, you see light: sparks.

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Answer 2

An electrical arc's size and magnitude is dependent on the current flowing through the conductor. The arc, or spark, is created when a higher potential flows to a lower potential. The lower potential side would be considered the load side. If the said electrical connection already exists, then current flow is from the source (higher potential) to the load (lower potential). When the path is broken, perhaps by a loose connection or opening of a switch, then the air gap between the two conductors will ionize and actually conduct a certain percentage of electricity. Air, by nature, is not a good conductor. So it takes a certain voltage to "breach" the gap between two conductors. The higher the voltage, the larger the arc. Also, the higher amount of flowing current, the larger the arc, as more HEAT will be given off. Now, the sparks that visibly "shoot" out into the air from a loose connection is actually burning metal. The arc's heat between the two conductors vaporizes or burns the metal, whether it be copper, steel, or aluminum. After examination of a faulty connection, you will notice the metal to be pitted, burned, and sometimes eaten away.

Answer 3

The flow of current always pass through the shortest route via high conductive materials. Since there is a gape in the path of the flow of electricity current it tries to reach the opposite pole by jumping in the air. The electricity jumping in the air is only called sparking.

Answer 4

as there is connection made means curreent is passing thru it. when there is loose connection it menas circuit is getting connected and disconnected. at this time when disconnected wires come closer charge is get created between the wire ends due to potential difference and due to this charge sparking occures...

Answer 5

the electrons are flying so fast that they jump through the airgaps in the loose connection, escaping their conductor and becoming visible

Answer 6

for the same reason water flows downhill
the current is trying to find a ground

Answer 7

electrons ionizes the air and tries to pass through

Answer 8

Because of the leakage of current or electrons