Q. Why are AC to DC converters necessary?

Answer

Typically, electricity supplied to home is 100-200V AC but some electronic devices require 5V DC voltage to operate. Thus, a power conversion from AC to DC is necessary. Also, electricity generated at plants is in AC form that is stepped down to reach 200V at the outlet. As AC is easier is transmit, it reduces energy loss and thus, AC to DC converters are used.