The correct answer is: B. Battery
A battery is an electrochemical cell that converts chemical energy into electrical energy. It consists of two or more electrodes, an electrolyte, and a separator. The electrodes are made of different materials that have different electrical potentials. When the battery is connected to an external circuit, the electrons flow from the negative electrode to the positive electrode, creating an electric current.
The voltage of a battery is determined by the difference in the electrical potentials of the two electrodes. The capacity of a battery is determined by the amount of charge that it can store.
Batteries are used in a variety of applications, including portable electronics, electric vehicles, and backup power systems.
Option A: A power transmitter is a device that is used to transmit electrical power over long distances. It does not convert chemical energy into electrical energy.
Option C: An uninterrupted power supply (UPS) is a device that provides temporary power to a load when the main power supply fails. It does not convert chemical energy into electrical energy.
Option D: A generator is a device that converts mechanical energy into electrical energy. It does not convert chemical energy into electrical energy.