Telephone

When you think "phone," you probably picture the device in your pocket that lets you call pretty much anyone from anywhere. But long before cell phones existed, people relied on landline telephones to talk in real time to faraway folks. In this BrainPOP movie, Tim and Moby give us the 411 on the inner workings of these communication gadgets. Telephones convert sound waves into electricity, and vice versa. The electric signals are passed to a telephone box outside your home, which is hooked up to a local exchange. Meanwhile, your earpiece's speaker converts the signals of the person you're talking to back into sound using a different FM frequency. That's so you can talk and listen at the same time—although we don't necessarily recommend that! Is your phone ringing off the hook? Let the answering machine pick up, then tune in to Tim and Moby as they become answering machines to all your questions about landlines!

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