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.
Briefly explain the functions of electronic ballast. The high frequency electronic ballast overcomes the above drawbacks. The basic functions of electronic ballast are: 1. To ignite the lamp 2. To stabilize the gas discharge 3. To supply the power to the lamp The electronic ballasts make use of modern power semi-conductor devices for their operation.