A DC-to-DC converter is an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of electric power converter. Power levels range from very low (small batteries) to very high (high-voltage power transmission).
First let us talk about a case where the battery gets discharged, I have a circuit with a battery and a load.
The emf of the battery is 6V and the potential difference is a little less because the battery has internal resistance.
When a charge moves from the anode and reaches the load it loses...