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How Solar-powered Backpacks Work
electronics.howstuffworks.com/gadgets/travel/solar-powered-backpack.htm
Solar-powered backpacks are great travel gadgets. Learn more about solar-powered backpacks at HowStuffWorks.
Can you use a cell phone as a credit card?
electronics.howstuffworks.com/nfc-phone.htm
Can you use a cell phone as a credit card? Yes. Nokia revealed the first fully integrated mobile-payment cell phone in 2007. See how these phones work.
TV Evolution Pictures
electronics.howstuffworks.com/tv-evolution-pictures.htm
TV evolution has come a long way. See these pictures to go through the history of TV and TV evolution and learn about TV technologies.
10 Ways Watches Have Evolved
electronics.howstuffworks.com/gadgets/clocks-watches/10-ways-watches-have-evolved.htm
Portable timepieces have existed since the mid-1500s, but modern wristwatches are about 100 years old. Learn about watch evolution at HowStuffWorks.
How Digital Scales Work
electronics.howstuffworks.com/gadgets/fitness/digital-scale.htm
Digital scales are common measuring devices that harness several physical laws. Learn how digital scales weigh everything from peanuts to penguins.
How much power does a small transformer consume when plugged in but not doing anything?
electronics.howstuffworks.com/everyday-tech/plug-in-transformer.htm
How much power does a small transformer consume if it is plugged in but not doing anything? Learn how much energy and money you could be saving.
How Camera Flashes Work
electronics.howstuffworks.com/camera-flash.htm
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.
Do certain radio wave frequencies (like those used by cell phones) pose health risks?
electronics.howstuffworks.com/question4.htm
Do certain radio wave frequencies pose health risks? If so, is it safe to live within a quarter mile of a cellular phone tower or a radio antenna?
How Does a Breathalyzer Work?
electronics.howstuffworks.com/gadgets/automotive/breathalyzer.htm
A roadside sobriety test of touching one's nose or walking a straight line cannot rule out a high blood alcohol concentration. That's why the Breathalyzer is such a game-changer. But how does a Breathalyzer work? Read on to find out!
How do the battery testers on battery packages work?
electronics.howstuffworks.com/everyday-tech/question423.htm
How do the battery testers on battery packages work?