what type of power does a wattmeter measure
Wattmeter The wattmeter is an instrument for measuring the electric power (or the supply rate of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
Smart meter In August 2007, the UK Government held a consultation on improving metering and information about power consumption. The consultation attached the necessary draft regulations and proposed that, from 2008, domestic customers should provide comparative historical consumption data and electricity suppliers should provide a real-time display unit within time limits. For business customers, it was proposed that gas and electricity suppliers should install smart meters in those parts of the SME sector, where it had been shown to be cost-effective to do so and where such a meter was not already installed.[52]