Which device is commonly used to measure energy consumption?

The energy meter or sub-meter is a device specifically designed to measure energy consumption accurately. It tracks the amount of electrical energy that is consumed by a circuit or device over time, typically expressed in kilowatt-hours (kWh). This measurement allows homeowners, businesses, and energy providers to monitor usage patterns, identify areas for energy efficiency improvements, and accurately bill customers based on their energy consumption.

The other devices listed have different primary functions. A voltage stabilizer focuses on regulating voltage levels to protect electrical equipment, while a power factor corrector is used to improve the efficiency of the power system by correcting the power factor. A thermostat, on the other hand, controls temperature regulation in heating and cooling systems but does not measure energy consumption directly. Therefore, the energy meter or sub-meter is the appropriate choice for monitoring energy consumption.