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.
A ballast provides. the starting voltage for a fluorescent lamp and limits. the current passing through it. The ballast also provides. proper electrode or filament heating. For most of the last century, electromagnetic ballasts, sometimes referred to as âcore-and-coilâ or âmagneticâ. ballasts, were the only fluorescent lamp ballasts. available. Since 1988, when they first began to. penetrate the market, electronic ballasts have proven. themselves not only as workhorses of efficiency but.