Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

The pristine, regimented symmetry of digital circuit boards is occasionally interrupted by an irregular huddle of linear components. These aberrants are tolerated because they perform a variety of ...

A diode is a semiconductor device that allows electrical current to flow in one direction while blocking it in the other.

Several types of devices are employed in electronic systems to protect against voltage transients, power surges, and excessive voltage or current. Varistors is one of those devices that protect ...