Definition

• A battery adapter is a power supply that converts one form of voltage, called alternating current (AC) to direct current (DC) in order to send the required charge to the battery unit. A battery adapter is also referred to as an AC adapter or charger.
  
  

Rectification

• A battery adapter rectifies alternating current voltage input to obtain direct current voltage. Rectification is the process of converting AC current, which reverses direction, into DC current, which flows in one direction.
  
  

Process

• AC current contains positive and negative polarity, which enable the currents to change direction. The rectification process forces these polarities into one direction via the use of diodes in order to output direct current. Diodes are electronic components that enable electrical current to flow in one direction and block current moving in the opposite direction.