A voltage of 9V (volts) is a common electrical measurement used to describe the potential difference between two points in an electrical circuit. It indicates the amount of energy available to push electric current through a circuit. This voltage level is often found in batteries, such as the 9V battery, which is widely used in various devices like smoke detectors and remote controls. In practical applications, 9V is considered a low voltage, making it safe for many household electronics. Devices designed to operate at this voltage typically require a specific current to function properly, ensuring efficient performance without overheating or damaging components.