Dr. Howard Alig, MD is an ophthalmology specialist in Indianapolis, IN and has been practicing for 44 years. He graduated from Vanderbilt University School Of Medicine in 1968 and specializes in ophthalmology.
Tesla just unveiled its new at-home battery â here's what you need to know. 1  In 2015, Tesla unveiled the Powerwall â a rechargeable lithium ion battery weighing roughly 200 pounds that you can mount on your wall. Panasonic makes the cells for the Powerwall, while Tesla builds the battery module and pack.
Varistor Tutorial. The varistor is a passive two-terminal solid state semiconductor device that is used to provide protection to electrical and electronic circuits. Unlike the fuse or circuit breaker which offers over-current protection, the varistor provides over-voltage protection by means of voltage-clamping in a similar way to the zener diode.