We all are aware of revolutionary technology – visa debit and credit cards. Now similar cards are flooding the market. We swipe our card through the card swiping machine or card reader and our transaction is done. Super cool technology! Isn’t it? But have you ever wondered what is the technology used behind it? We all might have seen a black strip at the back of the card. This is a magnetic strip which produces electromagnetic induction and card reader uses this to determine the card details. Sounds interesting?

Ohm’s Law

We all know that every object has a tendency to move from a position of higher potential to a position of lower potential. Even winds flow from an area of higher pressure to an area of lower pressure.
Similarly, even electrical current follows the same convention.