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How Ringtones Work

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Ringtones are the easiest way to personalize your cell phone. Find out how ringtones work and learn ways to add your favorite ringtones to a cell phone.

How Camera Flashes Work

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A camera flash seems like a pretty basic device, but there's actually some interesting circuitry at work. Find out how a flash charges up and see exactly what happens the instant it goes off.

How Joysticks Work

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Video games are amazing creations, but the fact remains -- if you can't input, you can't play. Take a look inside the quintessential game controller and see how it has evolved over the years.

How Satellite TV Works

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Satellite TV offers many solutions to broadcast and cable TV problems. Learn what makes satellite TV different and how satellite TV works.

How a Circuit Breaker Works

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Circuit breakers are an essential safety component in any home electrical system. Learn about home circuit breakers and breaker design.

How Plasma Displays Work

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Flat-panel plasma displays are quickly surpassing bulky CRTs in terms of sales. Learn about plasma technology.

How Amplifiers Work

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It may seem like an audio add-on, but without an amplifier, you'd never be able to hear the music on your CDs (your neighbors might be happier, but would you?). Find out how amps pump it up to 11.

How Light Emitting Diodes (LEDs) Work

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Light emitting diodes form numbers on digital clocks, send data from remote controls and illuminate watches - the simple genius of the design makes it infinitely applicable. And now, LEDs are affordable.

How Surround Sound Works

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Learn about surround sound technology, get buying tips, read sound system reviews and compare prices and features on popular system models.

How Home Theater Works

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Learn the basics of home theater, from sound systems to TV screens. Review popular home theater systems and read our buying guide on home theater systems.