Universal serial bus also known as USB were introduced in 1990’s it defines cables, connectors, and communication protocol used in bus for connection, communication, and power supplies between computers and other electronic devices. Over the period of time, USB have seen various developments which is related to the speed at which data could be transferred. The voltage at which battery is to be charged depends upon the size of the battery and at end of a recharge period the charger is to be disc 更多
