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How Relays Work
electronics.howstuffworks.com/relay.htm
Powered by electromagnets, a relay is simply a mechanical switch, and you'll find them all over a typical house or car. Find out what these simple components are doing in all your electrical stuff.
How Refractive Vision Problems Work
health.howstuffworks.com/human-body/systems/eye/vision-refractive.htm
Millions of people have refractive vision problems -- when the eyes get blurry or can't focus on an object. Learn about four major types of refractive vision problems.
What's a scanning backlight?
electronics.howstuffworks.com/scanning-backlight.htm
A scanning backlight can be found in TVs and activates when and where it's needed to produce images. See how scanning backlights are used.
How LCDs Work
electronics.howstuffworks.com/lcd.htm
Learn about LCD technology, get LCD buying tips, read LCD reviews and compare prices and features on popular LCD models.
How Scanners Work
computer.howstuffworks.com/scanner.htm
Before the digital camera explosion, flatbed scanners were the way to get images into a PC and online. These devices turn images on paper into data you can access on a computer. Find out how scanners analyze, process and transfer images.
How Air Purifiers Work
home.howstuffworks.com/air-purifier.htm
Americans spend an estimated $250 million annually on air purifiers for their homes. Learn why people buy air purifiers and how they work.
What if I put a one horsepower engine into my car?
auto.howstuffworks.com/one-horse-engine.htm
A one horsepower engine would not be very practical if you were to put it in a normal car. Learn more about a one horsepower engine in this section.
How to Repair a Dryer
home.howstuffworks.com/how-to-repair-a-dryer.htm
A dryer is a large drum into which wet laundry is loaded. Air heated by a gas heater or electric heating element is blown through the drum to dry clothes. Learn to repair a dryer.
How Bug Zappers Work
home.howstuffworks.com/bug-zapper.htm
Bug zappers can help keep your backyard free of pesky insects. Find out how bug zappers kill insects and take a look at the inside of a bug zapper.
How to Test Your Car Alternator for Power
auto.howstuffworks.com/under-the-hood/vehicle-maintenance/how-to-test-car-alternator-for-power.htm
Do you know how to test your car alternator for power? Find out how to test your car alternator for power in this article from HowStuffWorks.