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Everyday Tech

How do batteries work? How much energy is your plugged-in gadget using? How do UPC codes work? Find this out and more with Everyday Tech.

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What is the difference between two- and three-pronged plugs?

Ever wonder why some appliance plugs have three prongs and others have only two? What does that third prong do? And what would happen if you plugged a three-pronger into a two-prong outlet with an adapter?

How Batteries Work

Batteries power all sorts of things -- they're in our cars, our PCs, our cameras, our cell phones. How do these tiny cans of chemicals provide power for so many of our daily conveniences?

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