A power meter is a device used to measure the amount of electrical energy consumed by a building, appliance, or electrical circuit. It provides real-time data on energy usage, helping users monitor their consumption and identify ways to save on electricity costs. Power meters can be analog or digital, with digital versions often offering more detailed information and connectivity options. In addition to residential use, power meters are also essential in commercial settings and are often integrated into smart grid systems. They can help utilities manage energy distribution and improve efficiency by providing insights into overall energy demand and usage patterns.