With all the time you spend on the phone, did you ever wonder how it works? In this BrainPOP movie, Cassie and Rita explain everything you’ve ever wanted to know about telephones! Discover the processes by which phones convert sound into electrical energy, and how they’re able to transmit signals over long distances. From the wall jack, through the wires, to your handset and back, you’ll learn about phone features such as the duplex coil, the exchange, and the hook switch. You’ll even learn how the electrical signals produced by touch-tone sounds work! So put down the phone and watch this movie — you’ll be glad you did!

Learn More:

What is telephony?

What were switchboard operators?

Who invented the telephone?