Calculating resistance and power isn't hard... and, as David explains, knowing Ohm's Law and the Power Triangle can be darn useful when you're designing a project, sorting out power supply issues, or want to keep from burning your car down.
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How To:
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How To:
Build a laser microphone
How To:
Make an SMS Intruder Alarm
How To:
Hack Your Mini-Fridge into a Vending Machine to Take Care of Freeloading Friends at Your Next Party
How To:
Fix Dead Lithium-Ion Batteries That Won't Hold a Charge Anymore
How To:
Hack your electricity meter
How To:
Hack a coin operated laundry machine
How To:
Make a satellite dish Wi-Fi antenna for free internet
How To:
Turn a laptop touch pad into a mini graphics tablet
How To:
Quick-N-Dirty Circuit Board Repair: How to Patch Faded or Corroded Traces with Pencil Lead
How To:
Block RFID Signals, Build an RFID Reader Detector, and Make Custom RFID Tags
How To:
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How To:
DIY Stick Welder from Old Microwave Parts
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How To:
Make an Infrared Mask to Hide Your Face from Cameras
How To:
Eavesdrop from a Distance with This DIY Parabolic "Spy" Microphone
How To:
Hack Software & Run a Trial Program Forever
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