What is relay and how it works in hindi

In this video i will explain you what is a relay, its consruction and its working.
relay in hindi

[@abhilashtm7459]

Sir make video on plc and scada

[@technews8702]

i am plannig to start videos on plc stay in touch

[@RakeshKumar-uu3fu]

Hi bro How many outputs can We take

[@technews8702]

I depend upon type of relay used some times two inputs and two output or 4 or 8 depends on type of relay