When you connect a battery to a circuit, the electrons flow from the negative terminal to the positive terminal. This flow of electrons is what creates the electric current that powers the device. The more electrons that flow, the stronger the current.
The voltage of a battery is measured in volts. Volts are a measure of the difference in electrical potential between two points. The higher the voltage, the greater the difference in electric potential and the more electrons will flow.
Batteries come in a variety of shapes and sizes, but they all work on the same basic principle. They store chemical energy and convert it into electrical energy by using a negative and positive terminal.
