key term - Batteries

Definition

Batteries are portable devices that store chemical potential energy and convert it into electrical energy when needed. They consist of one or more electrochemical cells connected together.

Related terms

Electrochemical cells: Devices that convert chemical energy into electrical energy through redox reactions.

Voltage:

The electric potential difference between two points in a circuit, which determines the flow of current.

Capacity: The amount of electrical charge a battery can store, usually measured in ampere-hours (Ah) or milliampere-hours (mAh).