Basic electrical.... "Relay"

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Lets make a simple project at home for our children so that they can learn basic things first... These fundamental concepts will make them well equipped for really understanding the Engineering.... not simply passing the exams.
We have made this project using scrap wood and few electrical components, and for safety this works only on 5V supply to Relay and 1.5 volt supply to Relay bridge.
Watch this kid explaining "What is a Relay"
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