Question

when a switch suddenly switched then a spark can be seen why​

Answer 1

Explanation:

The following are a few reasons why your light switch is sparking: It's a load spark – A load spark occurs when the electrical current flowing to your light switch doesn't want to stop. Basically, when you switch the light switch off, the current will attempt to jump from one contact to the other as they separate.

Answer 2

hey dude !!!!

=>> it's because of voltage... high or low ... if suddenly we switch off the switch then we see spark ... another factor is when neutral wire or live wire come in contact ...

hope this helps you ^_^