Microphones are now important input devices, and speakers and their associated technologies
are key output systems. Today, nearly any new multimedia-capable PC includes a complete
sound system, with a microphone, speakers, a sound card, and a CD-ROM or DVD drive. Sound
systems are especially useful to people who use their computer to create or use multimedia
products, watch videos or listen to music, or participate in online activities such as
videoconferences or distance learning.
The speakers attached to these systems are similar to those you connect to a stereo. The
only difference is that they are usually smaller and may contain their own amplifiers. Other
wise, they do the same thing any speaker does: They transfer a constantly changing electric
current to a magnet, which pushes the speaker cone back and forth. The moving speaker cone
creates pressure vibrations in the air-in other words, sound.
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