4G technologies are designed to provide IP-based voice, data and multimedia streaming at speeds of at least 100 Mbit per second and up to as fast as 1 GBit per second. 4G LTE is one of several competing 4G standards along with Ultra Mobile Broadband (UMB) and WiMax (IEEE 802.16).
An electrical ballast is a device placed in line with the load to limit the amount of current in an electrical circuit. It may be a fixed or variable resistor.
The ABC's of electronic. fluorescent ballasts. A guide to fluorescent ballasts. 2 The ABC's of Electronic Fluorescent Ballasts. 100 years of brighter, more efficient lighting. The first fluorescent lamp was patented over 100 years. ago by American inventor, Peter Cooper Hewitt. Cooper Hewittâs low pressure mercury arc lamp is the. direct parent of todayâs modern fluorescent lights.