A power meter is a device used to measure the electrical power consumption of a device or an entire electrical system. It provides information about how much energy is being used, typically displayed in watts or kilowatts. This data helps users monitor energy usage, identify inefficiencies, and manage electricity costs. Power meters can be found in various forms, including handheld devices for individual appliances and larger units for homes or businesses. They are often used in conjunction with smart meters, which provide real-time data and can communicate with utility companies for better energy management.