If you have been to a bank, you must have noticed that banks have a locker, or take the example of hotel doors. Both the places use a magnetic lock and are controlled by either a number secret code or a magnetic card, which when swiped opens the door. So how is a magnetic safe or lock better than normal locks? How does it work? Well, it works on the principals of ‘Magnetic Effects of Electric Current’. But what are these effects? Let us study more about magnetic effects of electric current.