In this project a mobile/battery charger is made by using voltage divider rule. Voltage divider is also known as a potential divider. Potentiometer having two resistor in it is the best example of a voltage divider rule. This charger has reference voltage lower than the input voltage. Using voltage divider any voltage can be derived by it by passing high voltage than the voltage we want. This is because output voltage which comes out is always lesser. Voltage dividers are used for adjusting the level of a signal, for bias of active devices in amplifiers and for measurement of voltages. A Wheatstone bridge and a multimeter both include voltage dividers. A potentiometer is used as a variable voltage divider in the volume control of a radio, in finding temprature, in battery charger, in loud speaker etc.