While at work the other day, I was extremely bored so I decided to think of blogpost ideas. During this time, I was starring at the credit card machine and I thought it would be interesting to learn the physics behind credit cards. Credit cards are an interesting system that uses a magnetic strip to store information. Credit cards use Faraday's Law which allows current to go through the coil in it. This current goes through simple amplification and this creates binary code. The signal is then read by the computer. This is a simplified idea of how credit cards work, but in the end Faraday's Law, Biot-Savart Law and Ohm's Law are all used in the creation of a credit card.