Question

Electronic devices operate on low voltages then why is a socket of 220 V used

for charging a MOBILE.​

Answer 1

Thus, higher current can be more dangerous than higher voltage; however, since voltage and amperage are directly proportional (in conditions that offer the same resistance), 110v wiring is usually considered safer to work with because it uses fewer volts and as such can only carry half as much current as 220v wiring.