Power measurement is the process of quantifying the amount of electrical energy consumed by an appliance or a device. However, there are several synonyms for this term that can be used interchangeably, such as energy measurement, power monitoring, energy monitoring, power metering, and wattmetering. These terms are all used to describe the various techniques used for measuring the amount of electrical power used in a given system. Power measurement is essential for understanding the energy consumption patterns of a household, commercial establishment or industry. It enables us to identify areas of energy waste, optimize efficiency and reduce our overall carbon footprint.