Can you show me a photo beam sensor or a magnetic sensor that is close to the size of my pinky? [more inside]
posted on Dec 3, 2007 - 8 answers

2 outlets & a ceiling light stopped working at the same time. None of the circuit breakers were flipped. What would cause this, and how can I troubleshoot it? [more inside]
posted on Aug 30, 2007 - 15 answers

Looking for resources that will teach me how to use capacitors, resistors, solar cells and other electrical components. [more inside]
posted on Jun 22, 2006 - 13 answers

The outlets in my new apartment are two pronged. I've been tearing the third prong off of power strips in order to plug them into the wall. Is this bad?
posted on Feb 13, 2005 - 18 answers