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There is a big problem for switches used under direct current or high voltages such as solar electric generation.
This problem is known as arcs.
Arc is a phenomenom where electricity runs through air.
When the voltage is high, electricity will run through air and make conduction.
This video shows a creation of an arc when gently peeling off contact points.
You can see a straight line of light as the contact points draw apart.
Electricity flows while the arc is present, damaging the contact points.